Wanted Short Telephoto 77 or 85

Ok so it's a bit of a long shot but I'm looking for a short auto focus telephoto so that leaves just the FA85 or FA77 unless there was an F version. I'd like to swap I have the following available for swaps or a combination.

FA100mm F2.8 macro absolutely mint with pouch.

FA43mm F1.9 ltd just 2 months old

FA28mm F2.8 I'd rather not but maybe

FA24-90 zoom rather not but maybe

AF360FGZ flash

Sigma 400mm F5.6 auto focus mint

SMC Pentax 300mm F4 K mount mint optics

M series lenses

20mm F4
28mm F2
28mm F2.8
28mm F3.5
35mm F2
35mm F2.8
40mm F2.8
50mm various apertures
50mm F4 macro
85mm F2
100mm F2.8
100mm F4 macro
135mm F3.5
150mm F3.5 mint
200mm F4
24-35mm F3.5 zoom
other zooms

Would you sell the FA100mm F2.8 macro? If so, how much?

Same question for the M 20mm.

I'd rather swap / part exchange for a telephoto, replace like with like. It's arguably the best lens I have, well at least as far as build quality goes. Idealy I'd want an 85mm F1.8 but Pentax have never made a reasonably priced lens in this range, well not autofocus anyway.

I'm not desperate to sell but if I did I'd probably want about £350 as it's like new and is arguably much better than it's successor. Not sure about selling it though. Thanks for the reply, cheers.

I'd rather part exchange it for an FA20, this one is mint as far as I emember but it is the "M" lens that I use quite a bit due to it's small size and wide view on the DS. The colours from this are lovely. If I was going to sell it I'd probably want £150 but I'm not there yet, thanks for replying, cheers.