And im planing to buy this for now beacause my PC is almost dead and try to upgrade it later. Will a i5 or i7 work on that MB?
More aboutbuget build
Yes a non K intel processor will be fine on that mobo. I said non K because on that mobo you can overclock ,and you don't need to spend moneys for something what you can use. 450W its enough for your PC.
should run fine on a 450W PSU...but get a good brand.
Antec Neo Eco 400W, Corsair CX 430W would be the ones I'd look at first.