I am a super-clyde and I have been using low-spoke-count wheels for a while on a few different bikes without much problem. However ... you have a few pounds on me.
If I were you I might consider a set of stronger wheels just until you drop another 30 pounds ... unless you are a careful rider. if you like to hop off curbs and sit planted in the saddle over bumps, you might have issues. I have broken a couple spokes form hitting hard into potholes (could happen to anyone anytime, but a lot more likely when the spokes are carrying my mass.)
I like Vuelta for inexpensive wheels ... you might get a set for $150--$200 with a lot of spokes ... I wouldn't spend $300 for wheels I only planned to used for one season---but I am not you and you know your situation better.
Honestly the stock wheels are probably okay ... but if you want a little extra reassurance go for 32- or 36-spoke.