I'm not sure what you mean by not wanting a "beginner kayak." The two you mentioned seem perfectly suitable for beginners. As to whether you will end up wanting something else down the road, that will depend on how your interest in the sport (or lack thereof) develops.
I agree that the more prudent choice financially at this point is to buy used, but nothing wrong with new shinies as long as you aren't telling yourself that these will be the only kayaks you'll ever want or need.
1 Canoe/Kayak Trailer
Touring Kayak Paddles
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