You can't go wrong with an -057 frame, however, that design has been around for a few years, there are now frames with newer trail geometry being sold.
Most likely the -057 from Peter is around $300 or so. You can have it custom painted, which can be nice instead of flat black.
Of what's on Peter's website now, the CS-887 looks pretty good.
Do you know what geometry specs you like? Maybe go do some test rides first, find out what you like, then look for a frame with similar geometry.