Obviously, I'm biased

but you did ask about Ozone kites so here's my 2c worth.
If you are mainly riding surfboards (does not matter if strapped or unstrapped) but also want to learn some unstrapped stuff the Reo V6 (or V5's as there are a few used ones around).
An alternative would be the Enduro V3 which has a wave/freeride/freestyle setting on the front lines bridle, but its not as good at drifting as the Reo, although it's probably a bit better than the Reo for strapless airs.
The Catalyst V1 and V2 were designed to be entry level kites with a 3 strut design like both of the above kites, but they would disappoint for your level and purpose IMO.
The Catalyst V3 is a tweaked version of the Alpha V2, so its a single strut kite and is a good allrounder and does drift really well for waveriding, but lacks the sharp turning of the Reo. I've done many downwinders with the Alpha V2's in 8/10/14 sizes and really enjoyed it for the cross-on conditions we get in Lennox.
So if I were you I'd be leaning towards the Reo V6 or used V5's.