Hoffa...when making an offer you should simply offer somewhat what you feel a boat with NO major issues is worth on the market today given the general condition of the boat you have observed. If there are major issues that you are aware of you should reduce your offer accordingly. For the CS36T...it appears that the current asking prices vary from $46K to 70K US and numerous sales have been made in the $50-60K range so you may want to start on the low side of the scale and negotiate accordingly. There are vast differences between the used boats on the market so if an owner has a very up to date boat that has been well cared for, you should be prepared to pay the price. All offers should be subject to survey, mechanical inspection and sea trial.
1. Survey should be done by someone of your own choosing and NOT someone recommended by the broker.
2. Mechanical inspection should be made by a good diesel mechanic who should also accompany you on the sea trial.
3. The sea trial should test all systems that cannot be tested on land...engine in gear at full RPM, transmission shifting, electronics, sails etc.
Once you have completed the survey you should re-negotiate the price to reflect any significant items found or walk away if there are grave issues that you are unwilling to undertake. (i.e. blister repair, engine rebuild etc.).
Hope this helps a bit...good luck, they are nice boats!