I use Pro's Pro Super Tacky overgrips. I got a box of 60 for less than £25 (~$40). Little bit thinner than the Pro Overgrip, but have good feel and grip. Not too sure about whether they are more durable, as I replace them every time I play, but as they are less than half the price of the Pro Overgrip (at least they are in the UK), that kind of negates that issue.
ERSA MRT & Pro Tour Stringer
Head i.prestige. Unstrung specs: 340g, 320kg/cm2, 30.5cm