There are boards with wireless capabilities, but they're few and far between. They're also not usually from the standard, quality brands. I'd just buy a wireless add on card. They run about $30.
A quick note before we get to the questions. First, I'm not a fan of the 470. I think it's overpriced and underpowered. That one especially. You can get the vastly superior (both in power consumption, overclocking, and raw power) HD 5870 for the same price, possible lower with combos. That makes the 470 a horrible buy. You'd have an argument (not a good one, mind you) if you'd picked the cheaper ones.
Second, that RAM isn't the best. Here's faster, better quality and cheaper ones:
G.Skill Ripjaws 2x2 GB 1600 mhz CAS Latency 7 $93 after promo code.
We really need to know what you're planning on doing in the future. Do you want to SLI? What size case are you looking at (I highly recommend a full sized one)?
My go to suggestion for the i5 is the
Asus P7P55D-E Pro. It's fairly cheap at $160, and it's loaded with great features.
For the PSU, if you stick with the 470, you'll want an 850W unit from a good brand. That means sticking to XFX, Corsair, Silverstone, Antec or SeaSonic. You can't go wrong with any of them, so check some prices and combos. If you switch to the 5870 (highly recommended), you'll only need a 750W. I know an XFX 5870 (XFX is one of the best brands, and happens to be one of the cheapest right now with an amazing "double lifetime" warranty) comes with a really good combo with an XFX 750W PSU.
For the case, some good brands are Antec, Coolermaster and Lian Li. I've also thought Lian Li was a tad overpriced, but that XFX 750W PSU I mentioned above comes in a good combo with their PC-K62 case. That could free up the 5870 for another combo. Some other cases to look at are the Antec 300 Illusion, Coolermaster 690, Antec 900 (or 902) and HAF 922.
I should also bring to your attention the fact that Intel is replacing the LGA 1156 socket by the end of the year. That makes the current sockets a dead end. You won't have an upgrade path. For that reason, it's generally advised that you strongly consider an AMD build with the X4 955 (and some good boards are the Gigabyte GA-790XTA-UD4 or GA-890GPA-UD3H or ASRock 870 Extreme3). Basically nothing else would need to change, except that AMD builds don't natively support SLI, which I think I've already made my point about the nVidia card.
So here's a couple of full builds that I tend to recommend that are likely around what you're looking to spend (I left out the SSD, but you get the idea):
The links/prices might not be exact, but it paints a good picture. There are also going to be better combos. When I get some more time, I may try to find them.
Intel:
CPU/Mobo:
i5-750 and Asus P7P55D-E Pro $340. I'm fairly certain the same combo exists with the 760, but if not, there's a good combo with the board and the RAM too.
GPU/PSU:
HD 5870 and XFX 750W $460
RAM:
G.Skill Ripjaws 2x2 GB 1600 mhz CAS Latency 7 $93 after promo code
HDD:
Samsung Spinpoint F3 1 TB $75
Case/Optical:
Coolermaster 690 and cheap SATA DVD burner $73
Total: $1,041
AMD:
CPU:
X4 955 $153
Mobo:
ASRock 870 Extreme3 $90
GPU/PSU:
HD 5870 and XFX 750W $460
RAM:
G.Skill Ripjaws 2x2 GB 1600 mhz CAS Latency 7 $93 after promo code
HDD:
Samsung Spinpoint F3 1 TB $75
Case/Optical:
Coolermaster 690 and cheap SATA DVD burner $73
Total: $933