Carters are awesome, I love mine.
If you are talking about a bag for making an emergency ascent, then you don't need a lift bag, you want an SMB. You only need a lot of lift if you are lifting heavy objects. Also, an SMB will stand higher out of the water and be easier to track by the crew, especially if you are drifting.
Here is the one that I have. They are also good for redundant buoyancy if you are diving in a wetsuit.
Most northeast boats consider a lift bag to be for lifting things (artifacts, mussels, scallops, etc...). An SMB is used for an ascent if you can't find the anchor line. This is frowned upon, and will not make your captain happy, so try to avoid this at all costs. If the crew sees a lift bag surface (as opposed to an SMB), they will not necessarily assume that there is a diver under it.
Also, if there is current and the dive boat is tied into the wreck, and you can't find the anchor line and have to do a free ascent, you should try to tie off your line to something on the bottom. Otherwise, you will drift away from the boat, and if the captain has divers in the water he may not be able to chase after you.
Some people make a big deal about colors (yellow vs. orange) to determine the significance of the bag to the crew. The problem with that is that those standards aren't universal.
I like the Light Monkey and Halcyon style reels - easy to use with one hand, and lock off during your ascent if you are drifting. Some people prefer to use a spool in shallower water.