We have Edirols (MA-10 I think), they're on the missus's PC now.
I got them as an initial "stop-gap" solution for home-recording monitoring several years ago. They won't cut it for that job :lol:, but I have happily used them as the amplifier/speakers for a living room POD XT guitar rig. In fact, they were even our living room "hifi" speakers for a while (all audio in our living room goes through my mixing desk! :roll:).
I did that (guitar "amp") for a few months with no worries. They won't handle sh1tloads of bottom-end at too high a volume (but I was usually reaching "neighbour worrying volume" by then anyway - loads louder than I'd listen to other people's music).
For PC speakers they do a fine job. We're definitely not talking audiophile territory, but they get the job done without you thinking "my speakers is sh1t"...
The missus listens to most of her music on these while she's writing. (And I use her PC and these speakers if I want to do any web listening/viewing). From our experience, I think the 15s would be fine for what you want. But, like gwem says, try a few out in that price range, I wouldn't be at all surprised if you could better them for the same sort of money.