Originally Posted by penguinofsleep
Also I plan on shooting this with irons and/or aperture sights, mostly free hand but may want to use a rest/bags or bipod occasionally.
If primary use will be iron or aperture sights then I would suggest the 452 UltraLux (28.5" barrel) which will give you the longest sight radius. Next would be the 452 or 455 Trainer with a 24" barrel. The 455 is the one that you can change barrels on if I remember correctly. That may be a plus.
Here is my 452 UltraLux in a Boyd's RVT stock. Sights are BRNO Target Sights and installed a YoDave Trigger Kit. Sight radius is 34.5", great shooter.