Ok first off let me comment on the fact that you should be installing a separate ground rod for your antenna feedlines, i know this will cause some to argue bonding and such with the AC service ground, but you can't rely on tying your lightning protection to your incoming water line as most AC services use and call it a day. Install a ground rod, install a entrance panel for the coax, and ground to that.
DX Engineering makes a nice grounding panel, its an outdoor rated DeMarc box with an aluminum panel in it that you can mount your arrestors to. I have had this setup on my tower for almost 10 years now. As for the arrestors themselves, i use PolyPhaser, and every commercial site i have been to in the last 15 years around here have PolyPhaser protecting their equipment. They are very good arrestors.
As for UL listed, I don't see how this is an issue. Considering how many of these are in use on commercial sites, and how many are in use in home installations by ham's, the last thing i am going to worry about is UL listing on a device. What you have to understand is that in a direct strike all bets are off, i have seen commercial sites with the best protection that can be bought on a commercial budget not survive a direct strike. What your trying to protect yourself from more then anything is nearby strike energy and static charge buildup on the antenna system, which is especially a problem in the winter time but also in dessert climates.
Most hams use the IS-50UX or IS-50NX, U for UHF, N for N connector. As to the comments about the UHF connector, aka PL-259, its perfectly fine for HF and VHF use, its been in use for longer then some of these hams have been alive, and will continue to be. You mentioned a dipole, you don't need an N connector for HF use, total and complete nonsense overkill. There is a lot of guys using F connectors at HF and feeding them with RG6 along with a matching setup to use the cheaper coax, its not an issue. Now if your going above VHF and operating in the UHF band or higher then by all means go with the N connector, but your not going to see a huge difference at VHF and below, total horse hockey to say you need N connectors.
You can make a grounding panel pretty cheaply, i have built them by buying scraps of copper sheet from the local junkyard and drilling and tapping mounting holes for the PolyPhaser's, then a good ground and its all done. If your worried about an insurance claim due to a lightning strike then talk to your insurance agent, thats what i did. Most of them don't have any clue what your talking about, i finally had to pose the question as if my tv antenna or a satellite dish was struck, as thats about all they can understand antenna wise. Long story short the agent agreed that adding lightning protection was a reasonable attempt at securing the installation against failure, and if it ever happens it will be covered as i did my due diligence.