I've heard a lot of talk about different overgrips...but I can't keep it all straight. I'm looking for an grip that's really tacky. I also like softer grips but it's not as important. I sweat quite a bit too. I'm using wilson pro overgrips and they are quite nice.. but they lose their tackiness really quickly
Have a look at the "RKEP Grip" thread... many are giving thumbs up for the grips from RKEP... very tacky.
I personally use the Kimony KGT-102, which is especially tacky and soft at the same time: http://www.ebay.ca/itm/5-x-NEW-KIMO...ultDomain_2&hash=item4aba79bc51#ht_1129wt_932