not sure why you cant buy from online stores? either way... you're best config would be a Gigabyte motherboard, 2x2gb dDR3, phenom II x4, gtx 460 1gb, name brand 550-600w power supply, samsung spinpoint 500gb harddrive (may want 1tb, up to you)
You can't run sli on that motherboard, it will only run crossfire with two (or more) ati cards.
If you want to run one 460GTX, then I would buy a 890GX mobo. You can run crossfire on the 890GX as well, the 8X bandwidth for the two slots would not severely impact performance.
Here's what I would do; Get the 890GX board, go for USB 3.0 if you think you'll use it in the future. Get yourself one HD 5770. Put your build together and purchase some games. If you find that you are lacking graphics muscle then you can save for a second HD5770.
Fact is, the 5770 can max out any games at high settings with a 15inch monitor.
I do suggest you consider getting a newer monitor if you are investing this much in a new system. 22 inch monitors in the US run about $150-200. This is a nice size for the graphics card I mentioned. Again, one HD5770 will handle games at 22" just fine. Or if you really want the nVidia card, that would be fine too, just remember you won't be able to add a second in sli because the 890GX/FX chipset doesn't do sli.
Yes, if you plan on getting a new monitor in the future I would probably go with a SLI capable board (like those mentioned above) and a GTX460 - yay Nvidia! For the first time in months I recommend one of their cards instead of ATI.
Of course, if you can afford an ATI 5850 in preparation to getting a 1920 x 1080 22-24inch monitor.....then I would