Mistershine gave the same answers I would for A - D, so here's e - i
E. I wouldn't think the difference would be too much - but it's best to always get the lower response time, assuming the display doesn't cost a whole lot more than the other option.
F. That's a really broad question. It depends on your budget, room size, needs, etc. The element's contrast ratio doesn't look very good...I try to look for a display that has at least a 1000:1 contrast ratio (not "dynamic" contrast ratio - those are fake/inflated numbers)
G. If I were using a computer with it, I'd always choose the 1080p one - assuming it was 16:9 and not 16:10 (which I don't think there are any 16:9 displays that small).
H. Sorry, I don't know of any stores with discounts. Usually the 360 and PS3 are never discounted (because they are sold at cost), but you may be able to find a sale on an hdtv if you look hard enough. If you can find a website that will let you return large hdtv's (in case of defects) you could try that route as well - most of my electronics (which were all bought online) were purchased for below MSRP.
I. Something like this will be just fine for HDMI. I use a longer (but still comparatively cheap) HDMI cable from monoprice - there's absolutely no reason to pay a premium for HDMI cables.
Any HDMI cable is compatible with the PS3/360.
