Hey Seth,
I got approval to land!
Let's give you some background so you can make an informed decision.
The list of qualifications really limits your choices, but I'll give it my best shot. The two most limiting choices are the rack and price. The majority of manufacturers will miss on ONE of these two areas. Skimstyle boards
like the Walzer, Phase 5, etc will fit in the rack but are typically more expensive than $300 and aren't condusive to aerials.
Water wraps around curved surfaces and when it does, it makes releasing for aerial tricks hard. To step up to airs you'll need
a board that releases well. Look for sharp or NON-rounded areas of the tail where the board contacts the water. Most true surf-style
boards will have "hard" or sharp rails in the back. Most of the "pop-out" or molded boards from the larger manufacturers like LF/CWB/HL will also have this attribute.
There are two other factors that assist airs, one is speed - you'll need to generate speed up and into the lip to launch into the air. Speed is mostly a function of fin base and depth. Again this is the mainstay of surf style boards like the Shred Stixx, TWP, etc. You can
still generate airs with skim style boards like a Phase 5, just not as high.
The last factor for aerials is the rocker. Boards with some rocker (that is the curve from the nose to the tail looking at the side of the board)aid in turning up and into the wake and as the board rolls UP it helps release the water, thus allowing the board to get airborne.
Durability comes from a few factors, one of the most important is the core material. A core material of 5# density or greater will provide the needed durability. Mostly this just eliminates surf style boards that are
made using traditional methods. That is 2# density core and 'glass. Wood has a 6# density or so, and Divinycell as a core or a skin is typically 5# density or stronger.
Lastly you wanted the board to fit into a rack - the MAJOR players do this well - they are wakeboard construction, injected foam and will fit in a rack. Skim style boards also work here - Phase 5, the thinner Walzers, Triple X, Calibrated, Trick Boardz, etc.
What this is leading you to is one of the skim style boards that uses Divinycell as a core. Those are Triple X, Phase 5, Victoria, Calibrated
and Trick Boardz (which now uses an 8 pound foam). Of those, the only two that meet the $ cutoff are the Triple X and Trick Boardz. OR IMO, the popouts from LF/HL/CWB that
are in the 4'6" LOA and don't have rounded rails at the tail. These boards tend to be more wakeboard'ish and as such don't have the performace level of the other manufacturers mentioned...however, they meet just about every other one of your criteria.
Did this help at all? If I wasn't clear, please let me know, ok?