I have the Logitech MX Duo (wireless) and I LOVE it. Batteries aren't a pain to me because it came with 2 rechargeable batteries for the mouse and the keyboard I just put 2 standard batteries in and haven't had to change them since I got it about a month or so ago. But I'd recommend staying away from the MS wireless set. I've heard they arent the best but the MX Duo is worth all $70 of it (newegg.com)
As for video card, get a 9800Pro. 9800XT's are too expensive (even after the price drops) for what it gives. Hell, why not just get an x800Pro

Also for the powersupply, PLEASE do a bit of research into one because in the powersupply market area, its quality over quantity because ive heard cases of people getting a no name brand 500w psu and it died within a month.
But other then that, everything else looking good!