I am very happy with my Samsung Infuse SGH I997. They are easily unlocked and are pretty much a Galaxy S with larger screen. $200 used buy it now common on ebay, maybe less on craigslist
You can unlock it yourself:
http://www.xda-developers.com/androi...ck-code-found/
or pay someone $10 or less for a code.
I have used mine with 3UK, Vodafone.de,Vodafone.nl, SFR, and Aldi's SIM's
Product Identifiers
Brand Samsung
MPN SGH-I997ZKAATT
Carrier AT&T
Model i997 4G Infuse
UPC 0635753489521
Type Smartphone
Key Features
Storage Capacity 16 GB
Color Caviar Black
Network Generation 3G
Network Technology GSM/GPRS/EDGE, HSDPA
Band GSM 850/900/1800/1900 (Quadband) HSDPA 850/1900/2100
Camera 8.0 MP
Operating System Android 2.2
Memory
Supported Flash Memory Cards MicroSD
Battery
Battery Type Lithium Ion
Battery Capacity 1750 mAh
Battery Talk Time Up to 480 min
Battery Standby Time Up to 400 hr
Display
Diagonal Screen Size 4.5 in.
Display Resolution 1280 x 720
Other Features
Touch Screen Yes
Bluetooth Yes
Digital Camera Yes
GPS Yes
QWERTY Physical Keyboard No
Email Access Yes
Internet Browser Yes
Speakerphone Yes
Dimensions
Weight 4.9 oz
Miscellaneous
Antenna Type Integrated