We went with a used 2004M and I was looking at the new 05M at my time of purchase as they were just comming out. I have been on both X' and M's and it always come down to the personal choice issue. What else are you going to buy used or new in the price range and VALUE range of the Mac? I say nothing else even comes close.
For about a month after making the M purchase ($27,000: honda 50, genny, roller), I was sure that I had made a mistake in not going with a cheaper/older X. But with over 35 excursions of daysailing and overnighting in less than the year since we have owned the boat I wouldn't have done it any other way!
But truthfully, I have been on an X long enough to know I would feel the SAME way about it too! So how does this answer help you? It is simple, buy the boat that you are most comportable with and don't spend hours upon hours worrying and fretting about your decision, you will be happy with a MAC, X or M.
Here are some random thoughts:
The larger aft bunk on the M is great
we removed the head door anyway because it SUCKS
I love the rotating mast and it DOES make a difference in boat speed
the M's helm pedistal helps with cockpit legroom
the M cockpit IS smaller, my family of 4 doesn't care about the smaller cockpit
my boat was 32 days old when I bought her, NOT 2-3 years like the "newest" X you will be able to find older item means MORE work
HATE the interrior cussion material, it gets cold and clammy, like the X fabric better even if it doesn't "Look" as nice
older things that have been in saltwater need more TLC to keep nice and "new", no matter how you slice it an older boat is USED and has used up some of its life
you can save about $10,000 by going with a used X...could be a good thing, heck with LOW rates currently a line of credit on the house would be a good option and get tax deductable intrest!
that $10,000 could go a long way in getting all the cool equipment you could EVER want for your mac.
If you are a Mod Guy, a new boat will be clean of all mods, depending on the X, you could be left with the PO's mods, like them or not
The blue hull looks great, but is a bear to keep looking nice!!! TRust ME!
X' only come in white, so they will always be slower than the Blue hull M
That last point may seem worthless, but then again all of my opinions are worthless, just like everyone elses opinion regarding which boat is right for you and your conditions!!!!
Make a choice, don't worry about it, and get out there on the water!
Rich