Opted for the $55 ebay version. No seals needed as it is metal/metal seal. Tank pumped up fine to 4K, no problems at all. Probably need to figure out how to get a one-way/check valve inline to make shutdown a bit less of a dance. Bottle came with 0 psi, so it was a long fill. Took it to 3K, gave the pump a rest, and then finished up at 4k. Looks like the pump needs an oil change now. I used 2g water + ice. Temps never got above 52 C.
One final question: When I take this to get filled at a dive shop, what adapter do I need to bring with me?