Well, the thing is, you know your 318 so well now, you'd have to start that all over with the M3. But the price is attractive. That would be a tough choice for me to make too. I would just double check that the 318's struts will work on the M. I believe there may a slight difference, but I could be wrong.
Aw, f#%k it, go for it . . you only live once