I'm up to 7! 1 each of:
Speedo classic cut
Seobean
aussieBum 1.5" WJ
Timoteo (2 of these actually)
Q Swimwear waterpolo brief
HARDCORESPORT water polo brief
I also have 2 pairs of board shorts but those don't count.
Actually, I bought the second pair a couple years ago because I had gained too much weight to wear the others anymore, but now they are way too big on me, so big I couldn't wear them anymore so I'm back in the other pair I haven't worn since freshman year of college/uni! They aren't the only item of clothing I've gotten rid of because they're too large. In fact, I had to exchange my most recent speedo purchase, the HARDCORESPORT, for a smaller size because the others in the size I usually wear were too large!