need help. buying in dash nav

hey guys, i was looking at getting an in dash nav unit for my 07 taco. i like the pioneer avic-x910bt but am not sure if it will fit. do any of you guys and gals have one? i looked at the fitment guide on the pioneer website and it seems like the avic-z110bt and the avh-3200bt are the only ones that will fit.
i found a new avic-x910bt on ebay with 1 yr. pioneer warranty for $630.( there is also a 100 dollar rebate) so that's why i am wondering.
i don't want to pay any more than $700 for one, and the 910bt seems to be a good buy.
if you have any more nav unit suggestions i would greatly appreciate them
thanks!

-chris