I have riden the 3 boards including the 2010.
2007 dont buy.
the 2008 is the best of all of them in regard what you are looking for in a budget.
But if you can get a good price on a 2009 I will recommend.
I have the 2008 still and like it and already got my 2010 iSonics and did not buy the 101 because is still a fast board and did not have to spend the money in that wind range. The new 111 and 131 are nice and the new tail cutout seem to help the board trim better and release a lot better also helping in the control when overpower and the planning.
Go for the 2008 if that is what you can afford right now.