Don't dwell on the tech specs so much in your case, just test ride and see what feels right. Your desire to bunny hop will eliminate at least half of your list if not all of it... a bike that fits in what I'd call the "fun" category is actually not that easy to find, you just need to test ride until you find the right match.
Also the shimano style vs sram style shifters might eliminate a choice based on preference. What ever the rear derailleur brand is, the shifter brand/style will be. Figure out which you prefer.
Based on specs alone, the Fantom 29er is my choice, based solely on the front fork having lockout (a must if you plan on riding city streets with hills imho). The bikes direct give more bang for the buck, component wise, but you can't test ride them in a local shop either.
26ers vs 29ers
Personal preference... but if your go with a 26", you can probably find a late 90's/early 2000 Cannondale hard-tail for well under $300 and then build it up a bit... I think that would be the best way to go for a first mtb.
There's really no reason to consider 29ers in your budget, as it's not a (relatively) big investment. I'd rather have a 26" than a cheap 29"
Suntour vs Rock Shox
It's not snobbiness, it's the fact that the cheaper bikes usually have cheaper components regardless of the brand. Cheaper bikes usually have suntour, so it has a stigma attached. I'd be more concerned about lockout than brand.
Personally, I think chainstay length is irrelevant for your use, especially since it's just numbers... get out and try some bikes!
For what it's worth, I like the look of the Felt frame and the tapered headset.
I'd definitely hold out on a good used bike. I sold my Gary Fisher Piranha (2008) not that long ago for $400 which is half of what I paid for it. That particular bike is much better than any of the ones you listed and was only a couple hundred more brand new. I took the hit because, frankly, I wasn't doing much trail riding and needed the money to get a better roadbike. Good deals will come along.