i've searched quite a lot for pre/asph versions of 50mm... if you can dig up my thread, loads of usefull info about v1, v2 and v3 pre/asph 50mm there... I settled for a mint v3 preashp with card unfilled bought at a store ( which stamped the card and therefore I got a leica warranty, cant get better than that ) for around 1750 usd... yes, it was steep but the thing was absolute mint ( first time I had to agree with a seller when he said "this was problably sitting on a collecters shelf since day 1", because hte thing is M/I/N/T ), plus the thing that it came with a 1 year warranty from the store and the original blank warranty from Leica that the store stamped and therefore I got a full leica warranty scored the deal.
First couple of rolls came in and Im in love - sharp when stopped down, creamy dreamy bokeh wide open, 0.7m focusing distance is very nice.
seriously advise it !