These firms are typically regional, since it costs money for each extra state they cover (taxes, legal fees, etc.). You don't need a tax consultant, because you can only deduct what the firm allows (I've found IPS' deductions "old school" for computers, since they still amortatize, and now you can deduct the cost the first year). Also, their fee is also not deductable, since you will no longer have a company (you are an employee of the firm you are using), and you never really are paid that money (your firm gets it). One of the other big advatanges, they usually have 401Ks, plus profit sharing, so you can really put a lot of money away for retirement without having to create a SEP (simple employee pension).
Don Demsak