The speakers in the AudioVision display far outclass any audio output any 68k Mac will ever make, with the exception of, say, using your Mac as a CD player. As the display goes, both of mine were incredibly sharp and bright, because they're trinitrons.
The only problem I ever had with mine was one of them had a problem with power fairly well into its life. (This was 2005 or 2006) -- Somebody more adventurous than I am could probably have opened it up and re-soldered the power connectors.
If you're just looking to play games, I would also look at some of the other 14-inch displays available, such as the Apple Color Display, M1212, which uses the same tube but does not require an adapter. (Or getting a VGA adapter and using whatever 14-17-inch CRT you happen to see locally first.) I don't know if the M1212 has the same issue with its power connector that the AudioVision does.