I like the PXG Extreme balls - they made the Golf Digest Gold List and offer them for $27.99 per dozen. They have a Tour Ball and an X version to compete with Pro V1 and Pro V1X at about 1/2 the price. I play the regular Extreme ball and love it. It feels good, spins good on the greens, and doesn't scuff too easily. They're worth a shot if you can't justify spending $55 a dozen.
My HDCP fluctuates between 17 and 20, so a Pro V1 isn't going to help me that much and I've played AVX, which is a great ball but costs as much as a Pro V1. For the money, the PXG Extreme is a no-brainer.
Honestly, I'm 100% in on PXG - I love their fitting system and customer service. Plus, they have the Hero's Program for Military Veterans and First Responders. Excellent discounts and top quality equipment. I'm on my second set. Here's my setup:
Driver - PXG Black Ops, 9 Deg, R-Flex Graphite Fujikura Ventus Blue 70G
3 Wood - PXG Black Ops, R-Flex, Graphite
3 Hybrid, 19 Deg - PXG Black Ops, Graphite
4 Hybrid, 22 Deg - PXG Black Ops, Graphite
5-GW, PXG 0311 XP, Gen7 Forged/Milled Irons, Graphite
52 and 58 Deg Wedges - PXG Sugar Daddy III Forge/Milled, Graphite
Putter - PXG Zero Torque Allan Mallet