Accessing my home-based iMac through the internet?

The Goal: Wake up a sleeping Intel-iMac, running Tiger 10.4.11 with a MacBook laptop running Leopard 10.5.4. And then, using the MacBook, I want to gain access to all the files in the iMac and be able to read/write/copy the files on to the MacBook.
The Catch: I need to do this, remotely, outside my airport express LAN network, through an internet connection miles away from the iMac.
My Current Set Up:
Home Base- the iMac, running Tiger, is connected to the internet via ethernet running through a D-Link 5 port ethernet router. The iMac is running OS 10.4.11. The home base internet provider is Time Warner Cable with a dynamic IP address that changes daily. I pay about $35 a month for this internet cable service. To get a permanent IP address would make me a commercial account that would cost me $95 per month.
Remote Base- the MacBook, running Leopard, is connected to the internet via a Belkin wireless router. The internet provider is AT&T DSL
The Settings on the iMac:
I have a password for both the iMac and a different password for the airport connection.
In the iMac System Preferences/Sharing I have Personal File Sharing on.
Remote Login on.
Firewall is On.
Internet Sharing is off.
Under the Network Settings on the iMac, the location is Automatic. Under the Network Port Configurations: Bluetooth, Built-in Ethernet, Built-in Firewire and Airport are all checked and active.
The MacBook has a WakeupLan application installed.
What settings do I need to change in order to reach my goal?
Do I need to download any other software such as a VNC client?
Which VNC client should I use?
Is the VNC client difficult to use?
I know there are services such as gotomypc.com but they only work for PC computers and those computers need to be on and awake in order to access them. Plus those services cost about $180 a year.
I’m looking for something much cheaper but still simple to use.
Any detailed help would be appreciated.
Thanks, Panther

The answer is possibly.
On the Mac you want to wake, make sure that you have Wake-on-LAN enabled (network preferences), and record the hardware (MAC) address of the machine. You will need that later.
Next, you need to enable remote login on your Mac. This actually turns on SSH. By default, this means that you can login to it, via terminal, using 'ssh' and your username and password. While SSH is pretty secure, using a username and password based login is still not very good. You should read the SSH documentation or look for tutorials on the Net on how to create an encryption key and switch SSH to using only key-based log-ins. Guessing a 2Kb encryption key is not going to be practical for most people.
You will also want to go to dyndns.org and register your computer and download a dyndns client (unless your router has that built-in -- many do). DynDNS.org offers a service whereby your computer or router can automatically update it's IP address in DNS. You will need to register a domain name, but from the standpoint of most applications, it will be as if you get a static IP address (the DNS entry will change whenever you are assigned a new IP).
After you've done that, you need to setup your router to forward a UDP port (7 or 9) from the outside to the broadcast address of your LAN. The broadcast address is the IP address of your machine, with the last number replaced with 255. For example, if your iMac has IP address 192.168.1.100, the broadcast address is 192.168.1.255.
Once you've got that going...
On the Macbook you need to install one of the various Wake-on-LAN applications (there are a number of them for OS X - pick one that let's you send the wake signal across the Internet). Configure the Wake-on-LAN program to use the IP address of your router, the port you selected above, and the machine address of your Mac. You can test it now by sleeping your Mac and trying to wake it up. Keep in mind, some routers and switches simply drop WoL packets. If this is the case, you're just out of luck.
On the iMac, make sure that you enable screen-sharing (sharing preferences), which enables OS X-built-in VNC server.
On the Macbook, install Chicken of the VNC or another VNC client.
To connect, first, use the Wake-on-LAN utility to send the wake-up request to the sleeping computer. Wait a few seconds for it to wake, then attempt to connect via SSH. You will want to forward VNC through your SSH connection like so (in Terminal):
*ssh -C -L 5900:localhost:5900 [email protected]*
... when you are logged in, start the VNC client, and connect to 'localhost'. Because you've forwarded the VNC port to the remote machine, it will go though SSH and connect to VNC on the remote machine.
The practical upshot is that you will have a highly secure login to your remote computer on-demand.

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