I don't know anything about the Lake Belton property market, but from looking at listings on Zillow it looks like there's lakefront availability in the $400K-$500K range with a 3/2 (and some poor soul trying to move a $2.2m new build that lacks lake front views). I'm seeing lots available for about $100K an acre.
You should know better than me who the buyer is for those, but I would think Houston, Dallas, and Austin residents have closer 2nd home options and those are the buyers who might pay a premium for luxury (I'm sure there are Houston/Dallas/Austin people among the buyers, but they would be more concerned with affordability). Otherwise, the goal with a flip is to spend the least amount possible on anything that doesn't confer luxury.
I think I'd go with something modest and wouldn't feel the need to have two ovens. All I'm seeing is Samsung appliance packages on Costco's website, but if you can get something that is an upgrade by brand but is their lower quality model, I might go with that.
Caveat is (and I should have asked this) is what is your ideal sales price? You don't put Whirlpool in a $1.5m home and Thermador in that $400K house described above.