Hrmm if I can't do metroPCS or INpulse Verizon prepaid (Don't want Page Plus Cellular and their limited data) I might try and take it over to Shaka Mobile:
http://www.shakamobile.com/index.php/shop/plans 60 bucks unlimited everything.
Shaka is a Sprint/Verizon MVNO and they've got a Samsung ACE on their phone list, to be purchased... So if I successfully got it turned on I could get them to tell me the MMS and Web settings for the ACE...... Hopefully that would work.