I think people are. being unfair to the OP for having 100 records. MAny people claim to have 10k or more records and to know each one well which is almost impossible ie 10k records of 45 mins equates to 7500 hours - about 312 days 24/7. Can i just say that before embarking on a format for the special occasions - and before you really build a collection - listen to a good reel to reel. I was gobsmacked when I heard them in a room by Meridian (yes of digital fame) i've heard many a great turntable - and it was in a different league.
I digress - if it is vinyl you want to build up (reel to reel takes a lot of space) go for it - enjoy it - we only live once - you clearly have a good ear with the Nagra gear you have already. Please factor in a cartridge and phono stage. A deck of that calibre requires a great cartridge - the best value high end cartridge which is.a great all rounder is a Benz Micro LPS - phono stages... Nagra PLP is very good - Parasound JC3 I understand to be good (I have a Vendetta SCP2A) - Whest make some very good ones too.