No Fight Please !!! The quality of the letter composition can play a significant role in determining 3-letter valuations. General concensus states that the letters A, B, C, D, E, F, G, H, I, L, M, N, O, P, R, S, T are considered premium letters. Other lesser high quality letters include: J, K, U, V, W. Lower quality letters include: Q, X, Y, Z. Domains selling for less than the above figures would represent a strong buy in today's market. Premium letter only domains tend to fetch a 500% to 600% premium (or more) over the Minimum Wholesale Price. Mixed letter quality domains have valuations somewhere in the middle of these two extremes. Source : 3character.com
I would hazard for the specific 4 letter domains, W MAY be a good letter IF it is the first one as many radio stations are 4 letter codes starting with W.