General concensus states that the most desirable letters (by demand and usage) are:
A, B, C, D, E, F, G, H, I, L, M, N, O, P, R, S, T
Lesser premium letters include:
J, K, U, V, W
Lower quality letters in today's market include:
Q, X, Y, Z
my personal valuation would be low $xxx maybe close to mid $xxx and that would be pushing it..