The Pearls are oddball phones, you have to really be a fanboy to want one. They have two modes of operation. They have 2 letters on each key, in the first mode, the first letter works when you press the key and the 2nd letter works when you press the key twice. The second mode is you just press a key once and keep going until you get to the end of the word. If the phone can figure out what word you really meant it uses that word, if not, it gives you a pull down list and you pick the right one. It learns after a while and you can be fast with it.
The 9700 (not on your list) seems to be the hot one now, especially if you have good 3G coverage. You didn't mention that at all, is it not a concern? If you don't need 3G or don't have coverage, the 8900 hyperlinked and I have rules. The 85xx are nice little phones with pretty good specs although the camera is definitely limited and it has a small screen.
The 8350i doesn't look like an upgrade from the 85xx, it has a 2.5mm headphone jack and only 128M of RAM which is going to start boxing you in eventually.
Note, you need to pay for a data plan with any BlackBerry. What that gives you is the absolute best push email on earth and a lot of other neat stuff, but it is an extra cost. Outlook calendar updates are aftermarket only, but the included software will sync contacts. The BB desktop software is abominable, because most business users run on a corporate BB server that has all that integration and RIM hasn't figured out retail customers need support too, they're a little behind.
Don't know about the other phones on your list, check phonewreck and gsmarena to see if you can get specs and other info and of course the manufacturer's sites.