Need a sales'y email checked for consistency / message / tone

We have an email to a customer who is claiming they have no budget but we think they need our services above and beyond our standard support services. In exchange for this favour we want them to agree upfront to helping us with marketing activities.

We need an email checked for tone as this is going to a Texan and we don't think a whining whinging pleading email is going to get us anywhere.

We are interested in an on-going "sales sanity check" and hope that this might fall out of this interaction. Today we spent about 3 hours writing and re-writing the email.

This response does need to be ASAP.

In a way we'd prefer someone with sales experience in the US so you understand their approach to manners, decorum etc, perhaps understand the particular intricacies of the different regions.