Zircons have a strong fanbass. They're probably a safe bet.
In my opinion, the easiest KZ to recommend is the ED9. Comes with two filters; gold for a fun sound with boosted bass, and the brass filter for a more flat/reference sound. The EDR2 is my current favorite though. It's fairly neutral with a bit of treble bias. To me the most "hi-fi" sounding of all KZs. The ZN1 Mini is a solid dual-driver. Bass probably isn't a tight as you would like, but the soundstage is huge and their mids are sublime for such a cheap earphone. They also EQ very, very well. The ED3c is another good KZ. Warm and bassy, though their bass lacks a bit of texture. Everything else is flat out good though.
If you are willing to bump up the price a bit, I've been enjoying the JVC HA-FXH30 for quite a while now. They use a 6mm, tip-mounted, titanium-coated microdriver. Tons of detail and very snappy. Stock tips don't really suit their sound though.