New iMac slow - should I do a "clean install"?

I recently bought an iMac 27 inch. I used the migration assistant to move my old accounts and stuff across to it from my old (now sold) Mac Pro. Which was updated using migration assistant from the previous Mac Pro.
I find it's not all that 'snappy'. And one thing I notice is that other Macs on my network see the iMac as Mac Pro (I guess a legacy of the old Mac Pro). I have it all backed up onto an external hard drive using Time Machine.
Is there a way to reinstall the system software while keeping my settings, accounts and stuff (if possible)? Something like a 'clean install'? Or some other way.
Cheers,
David

You've migrated old files from your Mac Pro that are not compatible. My suggestion is to reinstall:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.

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Should I do a clean install?

I recently bought a new Macbook Pro. I wanted to move all the files (pictures, music etc.) from my old G4 to my Macbook so I connected them using a firewire cable and used Migration Assistant to clone my machine.
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What is the best way to erase my Macbook Pro and return it to its "new" state. And then what is the easiest way to move just the files I want and not dump the whole machine on the new computer?
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