850m is not a long swim. It's a warm up (and I'm saying this as a middle of the pack swimmer on my best days). [Edit: To clarify, I did these same kind of 'long' sessions for the first few months when I was getting into Triathlon, I puddled around with 3 or 4 of them a week for about 3 months, making almost no progress. Went to a swimming coach, first session was about 1800ms, some with fins / pull buoy / kick, I never pushed myself that hard, and I damn well needed to. I also wouldn't have known what to do.)
If you're serious about triathlon, hire a swim coach and spend 3 or 4 serious days a week in the pool. It'll 'buy' you far more speed than a set of aero wheels.
Also "pretty sure" is not the same as "have done in in a race", go find out. Until you actually know from race day experience where things are holding you back, any purchases at this point are pure speculation. Do you need lighter wheels that give you more of a climbing advantage, do you want stiff wheels that give you more speed but might impact your run, do you want heavier wheels that roll well and support good cornering? And no wheelset is going to give you more than 2 or 3 minutes in a sprint (with the possible outlier exceptions of jumping from bottom of the barrel road wheels to Lightweights)
All these questions are ones that you won't really find out until racing. Spend the cash on swimming, it's a better investment.
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