I'm going in the direction of having different themed packs, similar to EZDrummer expansions or Pod XT model packs. The main pack will come out this year and will have some variety, but will primarily focus on modern, current-production 4x12 cabinets, as well as some modern bass cabinets, but I may throw a couple of vintagey things in for variety, so that it's a well-rounded pack.
Once I develop and release additional packs, there will be bundle deals, existing customers will get a price break on the new packs, etc., and each pack will have tons of impulses.
Thanks for putting in all the cabinet requests, I will be doing my best to honor all of them, it's just a question of when and in what pack. In order to get the first pack out before the 2008 holiday season, there are understandably some time and logistical constraints. I'm not likely to offer custom impulses, as Recabinet is a product line, not a service - but I will put surveys on the Recabinet site so that you guys can help steer the direction of the product line. And obviously, everything you guys suggest in this thread as far as cabs, poweramps, etc. will be explored.
As for phase issues, I will be doing my best to make sure the impulses can interact well with each other, but obviously I can't cover every combination possible, so I highly recommend using a phase adjust plugin. For the 1.0 release, Recabinet will be sold as packs of impulses, not as a standalone plugin, but it could evolve over time into more than that if there is a need.