hello out there, recently i put my warwick thumb 6 NT 1991 wenge for sale/trade. someone wants to trade or trade in his peavey B-quad 4 string. Both in mint condition. i feel like that my thumb is a little more worth on the market. he´s looking for a good 6 string, while i am looking for a good 4 string. (i am thinking trading in his bass plus let´s say 1000-1200 dlls?) what would be a reasonable deal for both?