I was looking at the Zowie EC2. Tried to email their support through the form on the site and got an internal error reply from their mail server, so that's a bit worrying.
Looking at reviews about the EC1/EC2 it seems their new mouse wheel isn't all it's cracked up to be as nearly everyone reports it as not working. Disappointing because it looks like a Razer DeathAdder and the EC2 is smaller which is what I would prefer but if the scroll doesn't register properly there's no sense in trying it. :/
I liked everything about the G500 but it's too high for me to use comfortably but everything about it was nice(texture, grip, software.) I'd recommend you try almost anything from Logitech. They're no frills, no marketing hype but just all-around good. When you said inexpensive though, that pretty much took away anything I would suggest. If you wait for sales you can pick up a MX 518 for roughly $20-25 if you don't mind glossy finishes it's a hard deal to beat. G500 hits around $30-35 and the G9x gets to around $40-45.
If you don't mind positive accel, the SteelSeries Kinzu tends to hit $15 on sale but it's only 3 buttons. If you don't mind a Z-axis issue(pretty minimal in all my trying it) the Razer Imperator is a perfect grip for small hands/claw grip imo. Unfortunately, Razer isn't known for quality and it has that ****ing high gloss on the sides(sorry but I HATE gloss on peripherals.)