BTW - there's nothing wrong with "run of the mill" Mosins either... and besides, you're going to end up with several... they breed like rabbits
I've been pleased with purchases from AIM and others in the past. One of theirs would be a good "first" purchase.
Most serious collectors eventually end up with one or more Finns... but that's in no way intended as "snobbery." The Finns represent a lot of interesting history, but do command a premium price. There are a couple of reasons for this.
First, they invariably have better fit and finish (no pun intended) than their Russian counterparts, as they were lovingly assembled and tuned by gunsmiths, not slapped together by Olga fresh in from the tractor factory. Hence, their renowned accuracy. Any Finn rifle that wouldn't shoot a 3 centimeter group at 100 meters was reworked until it did, or wasn't issued to the troops.
Second, their relative scarcity. The Finn rifles (all variants) were made in the hundreds of thousands. The Russians in the tens of millions.
Any Mosin, regardless of origin, is a rugged, reliable instrument of battle (and a not too shabby war club either).
Here's a pic of my M39. Not as good a pic as the one on Empire's site, but the rifle is every bit as beautiful as the one they show.