Which phone should i get? and why?

Honestly it depends on what carrier you're already on, or which one has the better service in your area, how much you're willing to spend, not only all at once but every month on a plan. As well as what you want to use it primarily for, here's some quick info I pulled off the phone sites.

Palm Treo Pro - Runs new for around $150

Phone and Mobile Office

GPS and Wi-Fi

E-mail and Web

Music and Video

Palm Ease

Carriers

Alltel -

Network: EvDO Rev A

Memory: 512MB (300MB user available)

Sprint -

Network: EvDO Rev A

Memory: 512MB (300MB user available)

Unlocked GSM device -

Network: GSM + UMTS/HSDPA

Memory: 256MB (100MB user available)

Colors

Black

Blackjack 2 Runs new for around $100

Microsoft Windows Mobile 6 Standard - Calender, email, to-do list, etc.

Tri-band HSDPA/quad-band EDGE world phone.

Large 2.4" 65K TFT display screen

Integrated GPS

Wireless E-mail Support

Microsoft Office MObile

2.0 Megapixal Camera and video Recorder

Stero Blutetooth

Embedded Mobile Instant Messenger

AT&T Video and AT&T Music

Video share calling

Embedded RSS Reader Client

QWERTY Keyboard

So the Blackjack 2 will run you a bit cheaper as far as the main payment, I didn't check out monthly payments for you. Though the Blackjack 2 seems to be available only for AT&T, so if you don't get great service through that provider in your area it wouldn't be best to get it. The Palm has a wider variety, you can get it through either Sprint (Worst service out of the choices), or Alltel (Verizon now) which is arguably the best service area, though AT&T is nowhere near as bad as represented on the Verizon commercials.

Both seem to do well as far as e-mail goes, so really if that's an important factor with you I don't think it'll make the decision any easier, though Palm is known for being good with e-mail.

Personally if I was down to choosing between providers Verizon and AT&T, I would be choosing between an iPhone or a Palm Pre, which comes out on Verizon soon. But that's not only expensive every month, it's expensive up front.

Here's some coverage maps for you to check out. Really the decision is up to you, but hopefully my information can help make it a bit easier.

VERIZON: http://img.photobucket.com/albums/v130/Fan_of_crui...

SPRINT: http://img.photobucket.com/albums/v130/Fan_of_crui...

AT&T: http://img.photobucket.com/albums/v130/Fan_of_crui...

I don't know much about these two. Whenever they are spoken of I always hear the Palm Treo receiving more kudos.

I personally prefer the iPhone becsue of all that it can do.