Yep, I've said this many times but the Elk M1 Gold combined with UPB technology will be the latest crave for us HA enthusiasts.
The Elk offers the combination of an Ocelot with digial output/input modules PLUS a security system the likes of a Caddx. So, you really should add up how much an Ocelot costs, a digial input and output module for it, and a Caddx security system before you compare pricing of an Elk.
Elk also seems to be actively designing improvements for this system. I hear of plans to add a touch screen and they recently came out with an Ethernet interface card. Wish I had one as well, but I can't justify the cost, plus I already have everything working with my present system (got all the bugs worked out).
The only thing the Elk can NOT do right now is IR.
Another nice thing about the Elk is the fact that both a Main Lobby and Homeseer plugins exist for it.