Holy crap that's a great score on an SL1200 (which version is it?). My mk2 has been reliable for 35 years....
Personally am not crazy about those Bose 301s, altho a friend of mine loves his. The 601s tend to get decent comments but never heard them (did hear 901s way back in
he 70s, tho, nice if setup well but never was very interested in owning them).
I had a Marantz 2270 before I got the SL1200mk2 but wouldn't want to go back to it (went to separates when I got the Technics tt, the Marantz crapped out but probably with some help at parties
)....just limited options altho if all you're going to do is play vinyl and no digital....could work well enough. I tend to be more interested in digital, multich and incorporating subs so modern avrs are what I'd consider as they're better tools for those jobs. If I were going 2ch something like the Yamaha RN 803 could be interesting....nice mix of accommodating old and new.
ps Does the HK 125 work okay? Or is something wrong with it?