Hey dermguy,
Speaking from experience, browsing the web with a PDA is painful at best. It's OK for very light web browsing or checking a POP email acct. but web based like yahoomail is a pain. You're much better off getting a laptop.
Wifi and bluetooth are OK for hotsyncing your PDA with your computer. Like Jim said, free hotspots are less common than they were last year but some cities and states are rolling out free wifi in public places. Texas has free wifi at all rest stops and my city has free wifi in all public places such as libraries and parks.
Anyway, I use my PDA to get online about once every other month. Usually to get a map, movie listings or weather report. Really, it's nothing more than you can get with a cell phone.
To answer your question, for internet access, I'd take wifi. The only argument for bluetooth and the internet is if you absolutely need to get online when out in the middle of nowhere. As long as you are in range of a cellular tower you could use your phone. Unless, of course, you have Verizon like Paul.