I recently built a roughly $700 build most of my money went into the GTX 660 graphics card. For LOL you barely need anything a normal desktop runs it fine. Sims 3 won't use much and you could do fine with a 7770 I believe my friend uses a 6670 on SIms 3 and GTA 4 and it works fine. I bought a Phenom II x4 965 for about $105 and it works fine. Case wise I got a Cooler Master 431 Elite for about $50 and is a decent case. Ram I spent $50 on 4gbx2 corsair I believe. I have a WD Caviar black HDD but she could drop $30 and get a caviar blue without effecting performance in Sims or LOL, also if your still tight you can get a 970 rather than a 990 mobo and it should work fine. My build runs Metro 2033 (One of the highest graphic games) On high settings and can run very high but I still need to buy the new HDD I'm using a very old one from an old PC and it has alot of trouble keeping up right now