I'm no computer expert on that kinda thing but I'd say screw the laptop, get a tower. Laptop's are usually closed units; you can't upgrade, meaning you're stuck with your current hardware (meaning getting longevity is not likely) While tower computers can be more on the expensive side, you've always got the ability to upgrade provided you can be patient enough. And if you go to upgrade your hardware, you can always either
A) Keep the lesser part as a backup
B)Sell it off to someone else who could use it for fun and profit. More the latter than the former, but still.
My two cents, however Pat should/would be able to give you the low-down on the more detailed odds and ends.