Hi Warren.
My comments and this thread might be better suited for the "Budget" forum here.
For guitar, vocals, and overheads, my best experience with ~$400 LDCs are Shure KSM32s. They are actually 3/4" diaphragms... somewhere in between SDCs and LDCs.
My other experience with "matched" pairs in this rough price range are the Rode NT1s, Audio Technica AT-4050s, and AKG 414 BULS. If I could find another old Gefell UM70s to go with my single, I'd vote for those as a pair... but that's too far out of your stated price range.
Of course, much will depend on your personal taste and on the instruments & sounds you are working with.
The KSM32s are built like tanks, reach very low (good for bass & kicks), are quite even up top (not brittle). The threaded stand mount is brilliant. Not a bad mic at all for ~$400 each. Worth checking out.