to my eye plasma looks better but some people like the way lCD looks better. Plasma seems to give the picture more depth. Some say that's because of the better contrast ratios but even LCD's that claim the same contrast ratios don't look as good to me. Aside from that, bigger is always better. I have no idea about the two brands you reference and have never seen them but I'd be careful about that part. Most people in here don't recommend straying into off brands but Vizio and LG get the best reviews in the less expensive sets. My vote would be 42" plasma.
Here is an lcd ive been looking at
And here is a plasma http://www.circuitcity.com/ccd/productDetail.do?oid=185627
So which one you think I should get I mostly game and watch T.V for long periods of time.