Generally you want the longest axle-to-axle you can find with whatever features you like as well (cams, limbs, etc). With some research, you can find many compounds for shooting with fingers without going "traditional" if you really don't want to. I like all kinds of bows, modern and trad, and shoot some of the compounds with finger tabs and others with releases. To each his own.

First off, if you follow this link, Hunter's Friend maintains a pretty extensive database on bow specs. If you look in the left hand column, you can narrow the database by axle-to-axle length. If you choose the "show only bows over 38" A2A" you'll see there are many, many choices for the finger shooter still. This is the 2006 database, but I am sure they will update it when most of the '07 models are out: http://www.huntersfriend.com/2006-Bow-Reviews/bow-specifications-main.htm


With regards to Reflex discontinuing the Caribou, I think they are sort of replacing it with another finger shooter's bow called the Montega by Hoyt; it looks like a nice bow and there may be a Reflex equivalent at some point if not already: http://www.hoyt.com/products/montega.tpl
The Caribou is one of the best known current finger shooting bows thanks to Chuck Adams, and since they are being discontinued, you might be able to find them at a discount; though due to their popularity with compound finger shooters, it is doubtful.

Another lesser-known company not listed is Lakota Archery. They have 40" and 42" models as well. They are very quick for finger shooting bows and are fairly easy on the sock-drawer fund: http://www.lakota-industries.com/LakotaArchery/LA_Specifications.htm


Just some stuff to chew on in your search.