I have done business with Frank and Hugh at Offshore Performance. You can't beat them on the East Coast, and for that matter, probably most of the country. Full Tilt sucks, and you can speculate why Frank moved from FTM to OP and took the Sonic franchise with him. You can do a search of all the threads in the Sonic forum over the past year or so, and I have mentioned NUMEROUS times they have come through for me. The Sonic factory even has a used 31SS for sale.
www.sonicusaboats.com
You may even find some for sale here on OSO. Rates are SCHAWEET right now on new boats, and you may want to order one.
I am also in Northern VA; keep my 26' Sonic in Woodbridge, and live in Centreville at the moment. Feel free to drop me a line with any questions. I have met the President as well as the COO of Sonic, and they are both fantastic gentlemen to work with. Best of Luck.
Dano from here on OSO is also a Sonic dealer in Ohio, and has a 31 I believe for sale. It is a demo. He sold a 26' Prowler to a guy here in NoVa as well, and Dano come very highly recommended as well.