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I vote for the Beat. My only reason: less to go wrong. I had a slide phone and it had problems. I have never had a problem with a flip phone.
 
I'd buy the rizr z3 since it is a slider (the rage right now) and the beat looks bulky and ugly. the rizr has a nice, clean design and shape. but it all comes down to personal preference.
 
I really am worried about the battery life of the RIZR though, is 3 hours enough?
 
I really am worried about the battery life of the RIZR though, is 3 hours enough?

My Palm Centro gets around 3.5 hours of talk time, and I can go up to three days (with pretty heavy usage) without charging it. You should be fine.
 
I'd go for the Samsung, simply because I've always had positive experiences with their cellphones, while the only Motorola phone I ever owned was a disaster.
 
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