Hi Dan,
Okay, I'm typing this while my majorly-talented and amazingly creative and successful SO is dictating. We just moved from Baltimore, and he is familiar with the territory in your line of work. (He's a 3-D computer game artist.) Here we go:
Initially, the salary increase is so insignificant that you almost HAVE to counter, especially if these guys are in the 10K/month category.
If you are interested in working in Baltimore, the professionals there are: Carton/Donafrio and Alexander and Tom. These guys are seriously into web development for major corporations. They, in fact, may be looking for new talent, and are worth a consult.
Agree to sign a NDA (non-disclosure agreement) and find out who the clients are and what the scope of the projects on hand actually are. Since the job they're offering you is Senior Designer, you should be privy to contract details such as time scope, budget, etc. This may inform your decision as to the viability of the company.
I can not stress enough: the position they are offering you and the salary quote are not in line with what positions in Baltimore such as this can command. I'd say counter with 5K over what you feel comfortable in accepting, and negotiate back from there. Personally, I wouldn't look at it for less than $40K (and that's working 'cheap').
With good freelance contracts, you could easily earn 32K and work six months out of the year.
If you are a good artist, you might also check out the computer game companies in Baltimore and Hunt Valley; Microprose/Infogrammes, Firaxis, Big Huge Games, Breakaway Games, Leaping Lizard (Silver Springs) among others. A junior artist starting out can command $40K to start, with full benefits and 401K, etc.
Additionally, if you are a good artist, with a good portfolio and wish to look further into this arena, send mail to laura at [email protected] and I'll be happy to provide you with some contact names at these companies.
Be well, Evan
(laura's amazingly talented and fabulous future husband)