I think your budget is a little unrealistic for the specs you seek. I see there is a local (to you) dealer selling the WS Ride sit on top (capacity 500 lbs) for $869 which includes a paddle and PFD worth around $100. It could be what you need now, and WS boats have good resale value so once you get to your weight target you could recover a decent amount of your cost bye selling it to re-invest in a sleeker boat.
70 lbs is not all that bad for a "big guy" solo sit on top, it doesn't have a lot of junk on it and it isn't as barge-ly wide as many of such models.
PFD's (Life Jackets)
1 Canoe/Kayak Trailer
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