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I've been in all of them many times. To me, the 342 is probably the largest and has a full size shower. There are different years that have more engine room as Greg mentioned. Get a 2005 or newer to avoid that. The 310 went thru 2002, then it was 312 for a couple years, then a 320. I had the 2002 310, which was the first year with MPI and full smartcraft. 8.1s in a 342 would be really good. I've rode on several 342s with the small blocks, and I believe it is one boat you'd really benefit with the larger engines. (just my opinion, don't want to start anything here)
I agree on the walk-thru windshield. I have it on my 400 and love it. SR doesn't have any larger boats with it.
Dream 'Inn III -- 2008 400 Express
2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX