I would not go with any company if you are not totally happy with the information they provide and the way in which they deal with your proposal. I would certainly be wary of paying any monies up front without cast iron guarantees that the money will be returned if your proposal is not accepted.
There are lots of good companies out there, but on the flip side there are lots of bad companies. You need to be certain you choose the right one.
Take a look at
www.iva.com for a list of companies together with customer reviews, give a few a call and only when you are happy should you proceed.
Melanie Giles who posts on this site comes highly recommended and she is always on the forum to offer advice, even in the middle of the night for some reason, I think she must be super human.
I am with ClearDebt and find them to be professional and understanding and would recommend them, but the decision has to be yours, so do a bit of research and go with what suits you best.
Good luck!!! J.