The crappy rate that the blues increase in capacity is one of the main reasons I run only blacks.
greens / eco drives are just too slow for my liking, even as storage drives when in a system. (side note: noisiest drive I had was a sea gate green drive)
I have not bothered trying any other 7200 drives as a program / bulk storage drive as I always seem to find some reason not to use them.
I was a raptor user for a while, but SSD's are cheap enough to forgo the raptors, especially with the lower capacity of both, it just makes blacks all the better choice for program/ short term bulk storage. (note: i have a lot of greens for longer term bulk storage, but they are all DAS setups that are powered down most of the time).