New today is a very cheap but nice unbranded seatpost. I think the two big issues with the older Kona Sutra frames are the odd 26.8mm seatpost size and braze-on for the front mech. Braze-on front mechs were meant to ensure you had a big choice as it didn't matter what your tube size was, any and all would fit. That's great if manufacturers produce braze-on front mechs; there are no MTB braze-on front mechs and braze-on road mechs are getting harder to find - I'm getting mine from Germany.
Seatposts are the first thing to be fitted to the bike. The reason for this is that the frame is held to the workstand by the seatpost, not the frame. Clamping the frame runs the risk of bending the tubing by over-tightening the clamp. If you over-tighten the clamp on a seatpost and bend it you only need to replace the seatpost - a pain that it'll cost you money but it'll cost less than a new frame! Once the seatpost is on, everything else can be put on the frame.
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