Great move buying the Tour instead of the Curve, you won't regret it. I had a curve and the Tour is better by FAR.
You can set up your Gmail as IMAP, that should probably show your stored emails. If you go onto the VZW BIS site you go to setup account, enter the email address, and choose to fill in the e-mail settings manually. (I don't do it this way, but I hear it works)
I don't use the Gmail app, either. I just set up my gmail account as pop3 and to leave a copy of the message on the server. Works fine, just make sure you set up a filter in your settings on BIS site to block messages from yourself.
One thing you can do is if you don't want a separate inbox for email/sms, you can combine the two into one. Since there are no custom themes available for now 6 icons on the home screen are valuable real estate for me. Just go into your email inbox -> Options -> General options -> SMS and Email Inboxes set to combined
As far as best browser, Bolt is pretty good. Opera is good also. I use the default along with Bolt/Opera depending on what I'm doing.
Apps that I have installed is Gmaps, BB App world, crackberry app store (better than app world at the moment), twitterberry and beejive IM. I'm waiting to install anymore until I get my Tour replaced. Having issues with the trackball.
One app you might want to take a look at is Quicklaunch. I had it on my Curve and I'm probably going to be purchasing it again for my Tour.