If you want to get Note 2 in T-Mobile, you probably have to wait al least till the end of this year. The Galaxy Note was just brought into T Mobile a few weeks ago only. $149 should be a good deal, although everybody knows the price will drop.
Dell Streak 5 is actually a decent phone, although the design and build quality need improvement desperately. The problem is that Dell over-priced it in most markets, and they are too slow in software update and bug fixes.