Hi,
I use iPhone 3G, Nokia E51 & E66 and Blackberry Pearl.
I would recommend you to consider the following two phones, since you are not interested in iPhone:
1) BlackberryBold (this is a 3G phone)/Blackberry Curve (if you don't need 3G)
2) Nokia E75 (US version if you live in US/Canada). They also have a European version, if you live in the rest of the world.
Check them out on
www.mobilecityonline.com (they have a great variety of unlocked GSM phones) Also, you can get these phones on Buy.com
I think if you would be happy with either of them - they feature full qwerty and offer great sound quality, easy PC integration (much better than iPhone). Currently, however, I carry iPhone for the last 2 months and am quite happy with it. I think I will buy E75 next. BTW, also check out Nokia N97 - it is a bit more expensive but less business, more entertainment oriented smartphone.