main thing when building your own computer is think longterm. if you can afford 700 bucks then that's a good start for a rig maybe 1 year from now. when you buy "name" brand computers you are stuck with what they have. you can change the video card and perhaps the ps but that's just about it. in 2 years or even now your computer is already a pos.
if you buy you build your own and have a budget in the long term you will save money. when i built my e8400 based computer i spent about 700 bucks. about a year later I sold the mobo, ram and cpu for 200 then used it towards a 2500k cpu, mobo and ram. total spent was about 300 bucks. I overspend on my first video card (evga 465) got it for 300 bucks my second one cost me 120 shipped.
I can upgrade if I want to for about 300 bucks with my current cpu/ram/mobo selling. but I see no point as I wont really get any higher frames than the steady 59 I get with everything on, except ev and shadows at 4096 (lowered to 2048 as I dont really see a difference).
I have 3 monitors all bought on sale at different times from different brands. I used magazines to have them all at the same height.
If I could do it all over again I would have done the same thing except buy that 300 dollar card.
one thing I regret doing is not thinking that I could build my own computer 6 or 7 years ago when I bought the gateway. then when i tried to upgrade, I realized i was stuck with what they would sell to me, which wasnt much of an upgrade. I had gotten the top of the line 1,400 computer which was useless literally a few months later. I sold it for 300 bucks and I was lucky to get that.
recycle cans, bottles if you have to. trust me, I refilled water bottles for me and my gf for 6 months using a cheap water filter to save enough money for my second monitor. since then I have yet to buy another overpriced water bottle at the store.
semp