Old iMac 8,1 slow -- how best to improve?

I have an old iMac for the kids: iMac 8,1 Core2 Duo with 3GB (2+1) RAM.
Recently upgraded it to Mavericks 10.9.
It's running quite slow; free RAM is always pretty low.
My question is, what will improve performance most?
Upgrade to an a 120GB SSD I have lying around?
Upgrade RAM to 6GB (4+2)?
Revert to older OSX? Which version would be best?
Disable multiple user accounts? (We have one for the parents and one for each kid, with Parental Controls -- but I notice the extra accounts uses up more RAM.)

Running on 3 GBs of RAM is really not enough RAM for Mavericks.
Your iMac year and model can take 6 GBs of RAM max.
I would install the full 6 GB of RAM.
Correct and reliable Mac RAM can be purchased from online Mac RAM sources Crucial memory or OWC (macsales.com).
OWC is the only source for the 6 GB kit OR the needed 4 GB RAM module.
Unless you have a known good and proper data backup, reverting to an older OS X version involves a complete hard drive reformatting and complete, clean install of a previous OS as well as re-installation of all of your applications.
How full is your Mac's hard drive?
Locate your iMac's hard drive icon on the OS X desktop. Click the icon once, then use the keyboard key combination Command-I. This will give you additonal info about your iMac's internal hard drive.  
Post the used and available hard drive space in a reply here.
Your system could have some incompatible or unnecessary software installed that is compromising your iMac's performance.
Do you run any antivirus software on your Mac? Antivirus software can slow down the normal operation of OS X and can cause adverse system issue and negatively impact  your Mac's speed and performance.
Do you have apps like MacKeeper or any other maintenance apps like CleanMyMac 1 or 2, TuneUpMyMac or anything like these apps, installed on your Mac?
These types of apps, while they appear to be helpful, can do too good a job of data "cleanup" causing the potential to do serious data corruption or data deletion and render a perfectly running OS completely dead and useless leaving you with a frozen, non-functional Mac.
Plus, these type of apps aren't really necessary. They really aren't.
There are manual methods to clear off unnecessary data off of your Mac that are safer and you have complete control over your Mac and not just leave a piece of auto cleaning software in charge of clearing off data off of your Mac. Their potential of causing OS X issues outweighs the implied good and benefits these types of hard drive or memory "cleaning" apps are written to do.
Plus, the software companies that write these apps make it hard to easily uninstall these apps if something DOES go wrong and these apps work in a way where you have no recovery or revert function to return your Mac back to its former, working state in the event something does go wrong.
It is best to never, EVER download and install these types of apps.
The risk to your system and data is too great a risk!
You you can have other third party software that is incompatible or not up to date to work with OS X Mavericks. 
You may, also, have connected peripheral devices that may need update drivers to work with Mavericks.
If you so choose, Please download, install and run Etrecheck.
Etrecheck was developed as a simple Mac diagnostic and reporting  tool by a regular Apple Support forum user and technical support contributor named Etresoft.
Etrecheck is a small, unobstrusive app that compiles a static snapshot of your entire Mac hardware system and installed software.
This is a free app that has been honestly created to provided help in diagnosing issues with Macs running the new OS X 10.9 Mavericks.
It is not malware and can be safely downloaded and installed onto your Mac.
http://www.etresoft.com/etrecheck
Copy/paste and post its report here in another reply thread so that we have a complete profile of your Mac's hardware and installed software so we can all help with your Mac performance issues.

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    iMac (Mid 2007 or newer)
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    MacBook Pro (Mid/Late 2007 or newer)
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