Trendnet was crap for me. Terrible USB N adapter. PCI Trendnet is terrible as well.
Go to keenansystems.com, and look at ENGENIUS--200-600mW!! of power and not costly. G is very fast and effective at that power level. Do N if you really think you need it. With Engenius,you will detect tons of access points nearby that you didn't even know were there.