The best bang for your buck will likely be the MVP 2. I have two, and they work great. They also have threading for both ego and 510, so any ego style clearos you already have will work without an adapter. Many of the mods out there only have 510 threading. However, considering the leaking problem, I'd research getting better toppers first.
I went through a slew of them when I started, I finally settled on carto tanks. I have no time to get into rebuilding, and I was never really all that pleased with any of the clearos I've tried. The least hassle came from Mini Protank II's. My husband still uses these a lot as he hates to fiddle with anything. I didn't really like the taste though. I preferred the taste from dual, top coils like the iClear 30 or iClear 16, but both seemed to require much more maintenance, and the iClear 16 leaked more often then not. Less of a hassle and good taste came from the iClear 16b. Bottom dual coil, but since they are plastic it restricted the flavors I could use, and since the coil couldn't e taken apart for a good cleaning, once they go they're gone. The coils were almost double the price of Protank coils too, so that hurt. I heard a lot of good things about Aspire bottom dual coils but I haven't tried them as of yet. I may not try them, since I'm quite happy with carto tanks and even my husband is slowly making the switch to them. For those, I prefer IBTanked. They seemed to be sized just right for cartos, and I've never had a carto accidentally slip out on me. Made of thick Pyrex glass and metal caps. I've dropped them numerous times and have yet to break one.
