Good Monitor?

Hello,

I've recently had to sell my speaker cabinets (I'm going to miss my Acoustic 410 & 115). I now route my sound directly from GarageBand into some cheap computer speakers. GarageBand, for all it's worth isn't actually that bad for producing a wide variety of sounds in the practice room. It's just that these speakers aren't exactly built for the low-end of the spectrum, and I usually get a much better sound out of my studio headphones than the speakers.

What speakers do you guys recommend for me to connect to my system in order to get a more accurate sound? Right now I'm using Harmon-Kardon soundsticks (which are fantastic home office speakers, but as you can imagine, they cannot take a regular low-end beating!), so I suppose any proper sound equipment would be an upgrade.