My mum's given me a budget of £200. I wanna prove her wrong that you can build a better comp than the one's you get in shops :/ but i have absolutely no clue on waht to buy and where to start. THis is my first comp build also. =] i hope i'll get turned haha be a challenge
have you thought about adding a bit to your comp? It seems that memory is very cheap now and an upgrade for your video card is easy (as yours is at the bottom)
First it probably has two 512mb sticks of memory, so removing them and replacing them with two 1 gig sticks will speed things up. (the HP spec says DDR2 667 @1.8V is the memory to look for)
I like two 1 gig sticks better than four 512s as it can cause less probs and you can sell the 512s to get a little cash.
For a video card its up to you. The stock PS can easily run a 8600GT (dosent need extra power) but you could probably add a high end video card if you were willing to upgrade the Power supply as well. However a 8600GT and 2 gigs of memory would speed up things quite a bit. (thats what I use)