I have tried a couple setups:
1. Klip Natural Gut 16 w/ WC Silverstring 17
2. Klip w/MSV Hepta-Twist 17
3. Pacific Classic Natural Gut 16 w/MSV Hepta-Twist 17
Number 3 is now my permanent setup. I liked the way the Klip played, but didn't like the way it frayed so much. The Pacific doesn't fray and lasts longer. All three setups played well, but the MSV does produce more spin. I was worried about durability with the shaped Hepta-Twist, but surprisingly it lasted longer than the Silverstring. I think this is due to the fact that it has less contact surface area with the cross strings due to its shape. I believe this is the reason the Hepta-Twist produces such good (low) friction scores in the TW testing.
There are a lot of great strings out there.