The MBB is fairly high performance (well, so it markets itself as being high performance - never seen it in the flesh). Might not be the best board to start off with to get you back on your feet, so to speak. However, others might be able to give better info on the MBB itself (mathteacher??)
You may even want to start off on a minimal; although its only a guess as to whether you will pick things up again quickly. You might need one or two surfs and be back with the old style; or it might take longer.
Assuming you more or less click back into gear, I reckon what you really want is a board like this onehttp://www.grantmillersurfboards.com.au/waterskate.aspx
but of course he is in Australia so not much use. I just linked to it because he has a good description of the kind of board I think is worthwhile.
So more of an 'hybrid' shape than a blown up short board - thick and wide. Reduced rocker.
- 7S fish (is a 'fish' but really only because it has a swallow tail, otherwise its pretty much a hybrid)
- firewire addvance (<- this would be my pick, maybe a 6ft 10 or a 7ft2; if you have the $$)
- any other hybrid shape that is around 7ft or so...
- obviously a custom board
That is not to say a big shortboard isnt the go but it might be more of a second board than the first board back.
Actually, having typed all of the above, my suggestion would be to hire a board, or try a demo board, whether a minimal or a hybrid or a bigger shortboard, and see how you go. If you find it easy then a higher performance board might work; if hard and you are very rusty then there is no point forcing the issue. The hybrid style boards are well liked by many, its not a 'down step' from a shortboard.
edit: should have added - my 'philosophy' is that people should get boards suited to their abilities now/that they can reasonably reach within the next, say, 6-12 months. But this might mean you then need another board in 12 months if you want to push things further (but any board can be used to push performance). Anyway - others are more of the view that you get the board you want to end up on . I suspec there is an age thing - when you are young you can aim to achieve something in 2 years; when old you want to do it right now because in 2 years you might not be able to.