Streak
The Streak definitely divides folks, but I didn't want to splurge for both a phone and a tablet.
And it does both jobs good enough for me. I've read ebooks on it comfortably and can navigate this full site easily. The screen's the perfect size for viewing a map in your car. I'd like a better nav app but I'm patient...
If you're worried about the size, you could always just use a Bluetooth earpiece and keep the phone in your pocket.
Speaking of size, it's a relative thing. I remember the time when the phones were the size of car batteries. I almost bought one about the time the Motorola came out with one the size of a carton of cigarettes and 4 times the weight.
Tuna, I only paid $49 for minez at Best Buy...
And Z, mine fits in my shirt pocket perfectly.