[scary personal opinions as requested]
I'd rather get a 2nd user Yamaha or Roland than a new Alesis - which can fragile, TBH. I'd personally never get a kit from anyone that uses a proprietary cable snake to connect the pads to the module.
What heads are best? "Best" is down do you, really. Drummers have been using rubber heads on practice pads (and edrums) for many decades, and all rubber heads feel different as they use different compounds. Mesh is popular but can be bouncy in feel and suffer hot spots with a sensitive centre and noticiable fall off away from the centre (it can also sound like hitting Tupperware). Yamaha's silicone many would suggest is closest to Mylar and is very quiet, but more expensive.
While I understand your aversion to cable snakes, I really feel that for a person new to electronic drums it will just make it so much easier to setup and diminishes the risk of losing cables. If a cable got damaged replacement snake cables are very cheap and easy to find, you can also add a patch bay to connect your snake and feed individual cables to your pads.
second most drummers will find mesh heads more agreeable to play vs other surfaces.
third at the price the op is suggesting you will most likely won’t find many great kits.
I never had issues with hot spots even with my first diy kits. There are a few settings to adjust but once you do, things should work fine.
I agree that Yamaha generally has better sounds than Roland, no evil cable snake, and are built to last (like Roland). also similarly priced. But at the op’s budget he can do better than what he could afford with either Yamaha or Roland unless he happens to luck out and find a great deal on a used set.
to answer the op’s question no, I don’t think it’s a great deal, I would personally save to get to the $1000- 1200 ball park and look at Simmons or a used Yamaha or Roland. Check the music stores for demo units you can get a much better kit for much less than it would cost new. (I found my Roland TD-27 for $1500 after taxes) yes it was the floor unit, but after testing everything thoroughly and making sure there were no issues I bought it. The kit had barely been played there were no marks on any of the pads and the settings were still default which told me almost no one messed with it so it was basically new. The new price for that set at the time was $3500 so it was a steal. About a month prior I was in San Diego and the Guitar Center there had a Roland VAD 507 that they had added an extra bass drum and an extra floor tom to make it a double bass kit. They also added the Roland single pedals(which are surprisingly great) and hi hat stand as well as a snare stand, I believe they also added 2 extra cymbal pads, needless to say the kit looked amazing and the price was right $4599 for all that. For some stupid reason I didn’t buy it. I still regret it now… all that new would have been over $10k….
the other option is buy a super cheapo acoustic, add triggers and mesh heads, and cymbal pads, and say an older Yamaha or Roland module but the cheapest you can do will still cost you about $ 1500 for a complete 5 piece kit with hi hats, ride and a couple of crashes…