As the title implies, I am looking to get a new desktop because I am quite frankly tired of my laptop (yes its portable, but its also blah) Anyways, I have compiled a list of stuff that (I think) and would greatly appreciate any and all input on whether or not I will be making good decisions. Seeing as this could be important, I am a fairly average computer user, no video editing, but I do use AutoCAD fairly often and I do do renderings of my drawings. As of right now I dont do any intensive gaming on my PC because quite frankly I cant. I would however like to play some more intense games and therefore would like the computer to handle them at least moderately well. I think thats enough text for now, please please please ask me questions if it helps you help me

Oh, I plan on building this myself
Case; http://www.newegg.com/Product/Produc...82E16811129021
I'm thinking that the Antec 900 is a pretty good way to go. Its got tons and tons of positive reviews (did I mention it has good reviews?) which for me is a huge plus. The only downside I can find when reading the reviews is that its a somewhat small case, but the move to the 1200 would cost an extra hundred bucks, taking all rebates into account
Processor; http://www.newegg.com/Product/Product.aspx?Item=19-103-849&SortField=0&SummaryType=0&Pagesize=10&Purchase Mark=&SelectedRating=-1&VideoOnlyMark=False&VendorMark=&IsFeedbackTab=tr ue&Page=4#scrollFullInfo
Well once again this item has lots and lots of good reviews. Plus it seems like a ton of performance for a non bank busting amount.
Hard Drive; http://www.newegg.com/Product/Produc...82E16822136218
So I dont need a huge hard drive. Yes I draw in CAD but as it is I dont keep most of my drawings on the computer as it is, and I dont see that changing. I figure that because I dont use a lot of memory I can save some money in this department. This drive seems respectable, but to be honest I have no idea
RAM; http://www.newegg.com/Product/Produc...82E16820231275
First off, this RAM looks awesome. Its the important things that matter really. Anyways it seems like good RAM, a friend of mine bought some and has had no problems, plus its a good price (I think) so why not?
Power Supply; http://www.newegg.com/Product/Produc...82E16817139005
Uhm, I picked this for the sole fact that I think 650w will be enough power and the Corsairs appear to be the highest rated PS' on Newegg. If 650w isnt enough then I will probably just step up to the 750,850,etc corsair
Graphics Card; http://www.newegg.com/Product/Produc...82E16814133326
http://www.newegg.com/Product/Produc...-531-_-Product
Well I have been told that the GTX 460 is a lot of bang for the buck so I looked into them. I also have heard that the HD6850's are even more powerful for a similar amount of money as well as having better compatibility with an AMD system. To be quite honest I could care less but I dont really know the plus's and minus's between these
Motherboard; http://www.newegg.com/Product/Produc...82E16813131646
The killer as I know roughly -4 on a scale from 1-10 about mobo's. I pretty much picked this one at random based on the price. I have no idea if this one is good or not but roughly 100 bucks is what I would like to spend.
Parting note, I would like to keep prices for each piece around the same as the stuff I have linked. If thats not possible then so be it. Thank you very much in advance for any and all input