chrono1081, weird how your Mac outperforms your new higher spec'd Dell, but that's interesting to hear. Yep, SSD is what I'd like, I hear that's the biggest thing these days. Will keep that game development stuff in mind too, thanks for that.
alvindarkness, an in between does sound good, something more powerful than a mini, but not as expensive as a Mac Pro. I'm not so confident in going Hackintosh though, it's just that I want things to be hassle free, without having to worry about things going wrong, but it sounds the best of both worlds.
Dameatball, it's a Dell XPS 8100, 6gb ram, Nvidia Geforce GTS 240. As for the i7, it says on CPU-Z that it's name is 'Intel Core i7 860', Code Name: 'Lynnfield', not sure if there's anything else here that would help or not. This is my PC here:
http://www.dell.com/uk/dfh/p/studio-xps-8100/pd
The computer really does everything I need, I plan to take it in this week and see if I can get it sorted, I'm not sure if it's the graphics card or if it's the heatsink, but if I can make this last longer I'll be happy enough, I'm really just gathering information for future reference.
Dagless, heard that about Rockstar PC games, but I'm not too worried about it.
A big thanks to everyone who has replied, it's been a lot of help.