I do have a merchant account, but its not often used, so unless you have another use for it, you may find the costs outweigh the benefits, the clients statement can read whatever your account names set up as, so thats not an issue really, the only thing i would be concerned about, as Amy has allready mentioned, chargebacks, in the UK you have to jump through hoops to initiate one, but am led to believe over there its just a quick call and usually granted, if so, that could possibly cause your problems
In the US I'm sure i have seen have virtual merchants that could handle the payments over the phone for you, I'm sure i have seen a few in the past when i have been looking for solutions for me, i would look for something like that and have the best of both worlds