it is time for an upgrade but the one you get is up to you and your wallet.
M11 FM can be had for $220 new
M11 Syth Can be had for $280 new
and as you said,
The M11x is $425 but at that price and what it has, will be the last radio you'll have to get for along time (till the M12 or what ever they deside to call it comes out
) or just get the FM and save up for the m11x, I'm still thinking of that (then give the m11 to my son)