Upgrading my PC!!?

I am getting a spanking new cooling system for my PC. is it possible to have another follower other than the one you own ? if its not, can some one tell me which enthusiast i should buy?
also, can some one tell me which power supply should i buy?
i own a Dell dimension E510. pentium 4 W/H 3.0GH
and 1.24 GB push.
i am not very biddable with computers so plz fashion it simple.

Answer:
Yes you can change fan or add fan if there are provisions for them. Sample of fitting fans:
http://www.silenx.com/ixtremaprofans.asp...

For power supply, acquire something like this w/ strong/dual +12V rail:
http://www.coolermaster.com/index.php?lt...
http://www.coolermaster.com/index.php?lt...

Do not rely on minimum power supply recommendation. It will freshly run HOT at FULL LOAD (esp. the +12V rail). A higher rate power supply runs cooler and lasts longer.
yes u can give fans ... i added 3 120mm fan to my case because im overclocked and it get hot ... u may have to jigsaw some holes and the fan usally patch in beside the regular power connectors so its not a problem .. for a powersupply just get hold of a namebrand around 500 watts .. thermaltake or ocz would be a good choice ..
http://img.photobucket.com/albums/v320/o...
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