UT,
Just as a side note, I believe Prepaid ATM has a $500 daily withdrawl limit so with the amounts you bet, you might want to look elsewhere. I would certainly consider Western Union if I were you. You can even make WU deposits online (that is how I normally deposit). They cover fees on deposits and you can get a check sent back to you via FedEx for like $25-$40, which is a small amount when you are betting that much.
If you are betting nickels and dimes, stay away from smaller books so you don't get frustrated by lower limits.
I really think you should give WSEX a look. They have a link at the top of the forum. They are known as a good underdog book and I know you can bet 3 or 4 dimes (more if you call). Their software is not very good, but credit card deposits and withdrawls have always been easy for me. The only fee they charge is for a withdrawl via overnight mail.
I don't believe they offer overnight lines, though I am not sure about that. They also do not give sign up bonuses. The other drawback is that their software is configured to only allow you to bet "to win" on moneyline favorites. Take a look at it, you'll see what I mean. In my opinion, none of these things matter enough to make this a book that is not worth playing at. You should find very good underdog value there and, most importantly, your money is very, very safe there.
If you like bonuses and you are willing to deposit and withdraw straight to and from your checking account, then BoDog is a great choice. they are not a sponsor, though. Relatively low limits at Bodog (500-1000 online).