Hiya...Just getting back after a (little shorter) lay-off too...(My how things have changed)...I vote you stick with your FSR!!
I've recently been buying a few used OS engines off eBay and such...Up to this point I had never owned an OS engine...I must say I am really impressed!! I don't have an FSR...Just a few in the SF and RF series...But they are really nice!! Most of the ones I have purchased have required some TLC to whip into shape...I've defiantly over rode the cost of purchasing a new (modern) OS engine in rebuilding these Old School guys...But they are worth it IMHO...Time will tell if they are going to hold up...I'm just going to try and take care of them the best I can...
You can still find some nice looking FSR's on eBay from time to time...You may keep an eye out for a spare (parts) engine if you feel the need??
To me...It just feels a little more natural mounting one of these era engines to most of the aircraft I'm interested in building...I think (hope) they are gonna look and sound "right" if you know what I mean...
Good luck with your build!!
Have some Fun...
Chuck