Supra Sunsport 21V

[MJHKnox]

If you mainly take out your immediate family, the 21' will work fine. You need upgrade ballast bag system and a surf-gate to attach to the side of the boat. The 21 will surf fine with the proper weight. It's always been known as a great wakeboard boat too.

Per size - I would not buy anything smaller that a 22' or 24'. The 21' and 22' may appear to be only 1', but there is a difference. I would lean more to the 24, so you enough storage and room for peeps to move around w/o knocking too many knees.

The other area is how the cockpit is designed for seating.

[MJHKnox]

Per age, a 300-500 hour boat from the mid-2000s is not a lot of hours. Maintenance recs and pre-buying testing (compress/leak-down) are key.

With any Supra boat, most owners have done ballast upgrades for any of those years. They all needed it if you plan on surfing.

As for the bigger changes - here are some appx years:
Around 2009, reversible pumps. If you look at pre 2009, they might have sprinkler system - many have upgraded to rev pumps
Around 2010, the new screens came out
Around 2014, the exterior look of the boats started changing with the SC Model, then by 2016 they all looked different - SA, SE, SG, SC
Around 2015, the surf systems started coming out.

All the motors did not change much over those years.
325s - 350ci - small block
340s - 350ci - small block
450s - 496ci - big block
All GM plants. All had good track records. Around 2015 was the Raptor Motors

If you are into audio, most of these years were crappy systems (compared to now). Skiers did well when they moved to JL. Wet Sounds tower speakers too.