My flatmate uses a HTC Wildfire which is quite cheap, runs android 2.2 and is pretty fast, I'd recommend it for a budget android phone. Only letdown is it's tiny screen.
I myself use a HTC Desire HD, which probably isn't in your budget :p
Not sure what Android version or screen resolution you're after, but search www.t-mobile.com for "T-Mobile Comet Black Prepaid". Refurbished devices are going for $99 off-contract at the moment.
HTC desire. Extra advice. eBay.
Extra piece of advice. Buy a nexus one. Or galaxy s. The latter might be too expensive even on eBay but look hard. You might be surprised. I got my desire last year June (i think) for 400 dollars
[+] [-] TimJRobinson|15 years ago|reply
I myself use a HTC Desire HD, which probably isn't in your budget :p
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