MooseAmerica - can you get out and test ride those bikes for longer rides today? While you're out, see if you can ride a couple others, too.
Take notes on what you liked and didn't like about various bikes, then share that info with your LBS. The more info you can give them, the better job they will be able to do of finding bikes that suit you. (even if your likes and dislikes seem trivial during the test ride, they can be really good data points for bike selection)
I had to give myself strict rules: not allowed to buy a bike unless I've test ridden it at least two different days.
(only broke that rule... umm... a little bit. here and there. yeah.)
Come back and give us a full report! We love it when someone is going bike shopping!
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson