Squid

Hey guys. So I tried to post on the Facebook page but no luck on it. After having my 2006 mustang GT for 2 1/2 years, I am completely fed up with it- from reliability inconsistency to bad everything. I narrowed my options of my next car to 2, the fj or a jeep and decided that a FJ cruiser would be better. I have a few questions for y'all however.
1. Is there anything aftermarket wise that I need to purchase and install immediately after purchasing my Cruiser? (Snorkel, shock absorbers, suspension, mud tires, etc.)
2. Is premium fuel absolutely necessary for the cruiser? I've been reading around and some people say it does while others don't.
3. Will this last a substantial amount of time? ( looking for 6 years minimum) how often should maintenance be done?
4. What year cruiser was the best option to get? I know the newer are models are better, but some people feel certain years have better models than others.

Open to all opinions and answers, thanks guys (and gals)!