+1 on
The Engineer,
Red Leg, etc.
I personally shoot a Kreighoff .470 that fits me well. I had a pre WWII Belgian Jules Burry .450 #2 before that. Ammo availability finally ended up being a bit too much of a hassle, and George Caswell of Champlin Firearms wanted that .450 #2 more than I did...
FYI, there is an incredible opportunity right now for two left-over, brand-new S2 on GunBroker for $8,400 (
https://www.gunbroker.com/item/845084607 and
https://www.gunbroker.com/item/842311329). I actually saw these rifles a few weeks ago when I visited Mad Dog Guns in Phoenix to explore (again!) the worthiness of the R8 (I agree with the technical worthiness, not quite (yet?) with the financial worthiness of the $7k pro safari, but I digress...). These two S2 are gorgeous. If I were in the market I would buy one immediately. They are priced below used market... and brand new...
The S2 is a well engineered, reliable, accurate rifle. Period. It is also a different rifle. In a way, it is the opposite of the 89B. The S2 is a study in engineering efficiency (scope mounting, barrels regulation, etc.), while the 89B is a study in classic British doubles revival. To each their own... Likes and dislikes are opinions, not facts. Do not be concerned about the S2 technical worthiness. Actually, it is arguably technically superior to many other doubles that use traditional engineering. For example, I doubt a S2 can ever get off the face.
The one thing that deserves to be pointed out is that, as
Red Leg mentions, "the Blaser requires a different manual of arms and is a bit slower on reload." What he means is that the S2 will decock automatically every time it is opened, hence it needs to be recocked when it is reloaded, and as
The Engineer points out, this does require a significant muscular effort with the thumb. It is far from being as unobtrusive as sliding a classic safety. However, if you have a fully operating thumb, this is not as big a deal as some will make it sound (many quality S x S shotguns also reset to "safe" automatically when the action is opened), but it is a muscle memory that MUST be practiced and acquired. From this perspective, the K-gun cocker that does not decock automatically when the gun is opened for a quick reload, is considered by many as less obtrusive. It too requires the same type of muscular effort with the thumb, but it stays cocked until the shooter decides to manually decock it.
As to caliber, I would go either .470 or .500 depending on the rifles available. There is not a tremendous difference in either performance or recoil. The .450 is indistinguishable from the .470, but ammo continues to be less available for the .45 caliber doubles... Going down to .400 or up to .577 gets you in a different power/recoil category on either side.
I agree that you will see at DSC and SCI everything that is available, and I support the advice to be patient until then. The other side of the coin of course is that if you know and like the S2, it may be a gamble not to jump on one now...
Ah, decisions, decisions...
PS: as to Heym? Great rifles. I had a 55B o/u in 9.3x74R for years in France and absolutely loved it.