My girlfriend is getting the new blackberry touchscreen, I believe its called the Storm. This is her new 'I want it' item. I am getting the MBP and the iPhone pretty much the same time. (my contract with Long-Lines is up in May and I'll be hittin' up the Mac around then as well)
I would be willing to bet the iPhone will be the best phone to have as far as syncing to a computer (i.e. a mac) and most others shouldn't be too problematic. However, I am NOT speaking from experience as of yet.
I assume Blackberry's will do well with transferring data between handset and computer, they are an advanced phone with a lot of support. Shouldn't be that hard to set up.
HTH
Logan
EDIT: why not just make a switch to AT&T? They aren't THAT unreasonable in the smartphone world. I currently have an HTC and go thru a company called Long-Lines and pay 70 bucks a month for anything you can name. Unlimited CALLING/TEXTING/INTERNET/etc. Then again, its a small-ish company (great service) that allows them to do that. I've looked at at&ts rates for the iPhone upgrade and theyre not outta the ballpark compared to any big-name out there. I dont call that much so 450 is fine for me, Ill get the data plan thingy for 30 bucks and texting for somewhere around 20 and totals monthly are 90 bucks. Eh. It is what it is.
Do you WANT the iPhone?