A friend recently bought a
Sartek 21/13W adjustable li-ion for around $800. It only has 2 hour burn time at 21W setting (~4 hours on 13W), but a smaller battery also means a smaller canister, in case that's a plus for you, and you can always buy a spare battery if you need more burn time. Sartek has nice lights and from what I've read (no first hand experience), good customer service.
That said, I use a 21W Salvo with 6h burn time, and it's nice not to have to worry about it running out of juice or about changing batteries during SI. I had a few issues with it because I flooded it (my fault; forgot o-ring), but as a result I've had a chance to make use of Salvo's customer service, and can honestly say it has been exceptional, and has made my experience with their light excellent. I want to stress the importance of customer service because had Salvo been slow to respond, gauged me on parts and repairs, and so forth, my experience with this same light would likely have been quite negative. Below are some details in case you are interested.
After the flood, Salvo sold me a replacement for the destroyed battery at cost - it was still expensive ~$200, but I think the list price used to be closer to ~300-350 (they've come down recently). A year later the switch developed issues because the wiring had started to rust (guess some salt water got in there during the flood). I sent the light back and this time they replaced the wiring, switch boot and light cord for about $25+shipping. Not a bad price imo - it's nice not to have to worry that they will gauge you or something given how much these lights cost and since you pretty much have to pay what they ask for repairs...
However, they had messed up the repair (it happens) and the light died on the first dive after. At this point you might think I'd be pissed off and would be ripping into their service, but I'm not because they made up for it. Their turnaround was quick, but I still had to go one weekend without the light, which meant exploring very dark water at Bainbridge on a backup (later I found out it was the crap in the water; even a Salvo couldn't cut more than 2 ft into it, but at the time I blamed the backup light). Anyway, Salvo fixed the can light, but they also switched the ballast to a shorter (albeit fatter) one at no additional cost. i.e. my previously huge lighthead shrank, a big improvement imo since that (the size) had been my only complaint about the Salvo so far.
I also have 2 some regs from Salvo, which they upgraded with environmental seals when those kits became available, and replaced springs on the first stages because some divers had experienced issues with the first run of them of which mine came. Both upgrades/fixes were free of charge. The turnaround has always been either same or next day.
