Theres an FLT132 for sale 2nd hand on the forums for $2900... Thats what I'd be doing...
Out of your list, if I had the money to spend right now, this is how I'd have it ordered...
1 - FLT132
2 - AT 111 F/7 triplet
3 - AT106/FLT110 ~ The FLT110 might have a slight edge here depending on what focuser is on the AT106... If its got the 2.5" FT, then the AT106 is a winner, if not, then the FLT... It would also depend on what FLT110 is available these days... Earlier on, there was two versions, one with a TEC lens, the other with a TMB designed lens.. From what I read online the TEC model displayed much better correction, however this was some time ago...
The FLT132 is a TMB designed lens I believe, I know a few of them are for sure, I don't know if there is other ones with different lenses around..
Jump on Astromart and have a look around... I saw a TMB 130 Signature Series go for around 2K USD recently...
I don't know enough about the 127ED to make any valuable comment..
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