A few comments.
- That PSU is bigger than you need, and it's made by Enhance, which isn't exactly a mfg I'd be choosing. I suggest a Seasonic S12II 380, or, if you're dead set on modular, a PC Power and Cooling Silencer Mk III 400w (made by Seasonic) as being both better units and more appropriately sized (and cheaper, by the way).
- If you happen to live near a Micro Center, you can get an i3-2100 for $99 or an i3-2125 for $119.
- You should be able to get 8gb of perfectly fine sdram for $35 or less.
- Nice case - it's cheaper at Amazon with free shipping.
- If you're looking at small Rii keyboards, I suggest the Rii N7. It's handier to use with the touchpad in the center, and it has a full compliment of F keys. I like mine. If you want something larger, I also like my Iogear GKM561R.
- 60/64gb is the most common size SSD used for HTPCs. That's what I have in my HTPC, although I've started buying 120/128gb instead for other pcs. Prices have fallen enough to make it feasible. A SATA III will be nominally faster than a SATA II, and while I suggest getting one since your mobo supports it, I have to say I doubt if you'd notice the difference in the real world. The big jump is from hard disk to SSD; I've used both SATA II and SATA III and haven't noticed any real work difference, nor have I noticed a speed difference among different makes or controllers. You can find 60/64gb drives for $60-90 on sale. Will usually pay around $100 for a SATA III. Personally I avoid SATA III drives with SandForce SF-2281 controllers, and prefer Marvell controllers (Intel 520, Plextor M2S and M3S, Crucial M4) or Samsung 830 with Sata III drives, but SATA II Sandforce drives should be just fine. Watch the sales at Newegg. For example, they have the Patriot Pyro 60GB SATA III now for $65 after rebate, if you don't mind the SF-2281 controller. They always have something on sale.