Welcome GM,
There are quite a few great posts, so I recommend doing allot of reading on this forum....especially f5fstop. IMHO the H3 is not underpowered.
This is a myth that was started by a truck reviewer. Someone who tests V8's is not going to be very forgiving.
Have fun on your test drive, let us know what you think. Oh and if the Sales People are A-holes....MAKE them take you on a LOOOONG test drive
Drives 'em nuts.