I agree with Mark on the price. With regard to the accuracy, if YOU can, IT can. 97's (or 83's) are as good as the shooter. The Match chamber may add a very slight bit to the mechanical accuracy, but is a bit of a nuisance, requiring thumb pressure to seat each round. Over the course of a 40 shot Metallic Silhouette match, you may even need a small wooden dowel to assist in the seating. I had my 83's Match chambers opened up to Sporting chambers 3 years ago. My 97 came with Sporting chambers, and I'm happy with it.
Barrel length ? What kind of Silhouettes are you shooting ? NRA Smallbore Hunter Pistol ? IHMSA... Standing? Freestle? If Creedmoore in Freestyle, you'll need a 10" for safety reasons. If Standing only, It's a matter of personal taste. Most Master or International class shooters would pick a 10", if they're shooting iron sights. If they're shooting in a scoped category standing, there's no reason not to pick, say, a 7 1/2".
The barrel length question suggests that you're new to Silhouette shooting. A dedicated silhouette gun should have better sights, if shooting irons. I suggest the ISGW ( or after market Bo-Mar) rear, and the FA hooded post front sights, and I'd drop the .22 Mag. extra cylinder, thereby more than paying for the sights.
On the other hand, if you don't plan to be a serious Silhouette competitor, the extra cylinder and standard sights will be fine for hunting and casual target use, and I'd pick a 7 1/2" or 5 1/2" barrel.