hi, i have just acousticly treated my room and made huge upgrades to my equipment. including avalon vt pre! im stoked about it all! my mic is the Neumann tlm103 that i use on everything "acoustic". i want to start stereo recording instraments like dobro, mando, acoustic guitar, or anything else in the "string" family. what would be a great second mic to do this with the tlm103(or should i at all?). ive been looking at the c451($300used) or sm81($250used). i want great results with a budget. ive also been thinking of saving my money a little longer and getting a c414gold($500used). are there any suggestions that could go into these or any other mics. im looking for the open "acoustic" sound. thanks a ton in advance!