This one was using baby jesus gut. Surprisingly durable, very comfortable, very powerful. Not as good as the polys on the spin, though. I love how gut explodes when it breaks; much more exciting than a simple wire snip.

Global gut / Pro Supex Maxim Touch @ 57/59. Cost $9

Tecnifibre Black Code 1.24 / Bab VS Gut @ 57/60 – $22
Liked it, was a surprise break actually. Thought I had a few more sessions in that one. Not particularly durable.

Genesis Black Magic 1.24 / Pro Supex Maxim Touch @ 52/55 – $9
Lasted 4 hours, tops. Multis on the crosses just don’t last for me.

Genesis Spin X 1.23 / Big Ace Micro 1.15 @ 50/52

MSV Focus Hex 1.18 / Big Ace Micro 1.15 @ 50/52
Neither lasted as long as I thought they would. SpinX = much softer and much more power at same tension, greater durability. Both snapped within minutes of each other, though SpinX job had more playtime.
Setup: Fully poly job break. Tecnifibre Black Code mains @ 50, Signum Pro Poly Plasma crosses @ 52
Racquet: Tecnifibre 320 VO2

Good day on the courts.
The Big Money Break:

The mains are Babolat VS Gut ($45 a set or so), the crosses are Babolat Addiction ($13), so a $29 break. Good thing I string these myself.
It is unfortunate that the crosses broke before the gut mains; all of the good (as defined by popular acclaim and reviews) just aren’t holding up for me, even with gut. I can understand a cross breaking if the main is a poly, but with gut? That’s ridiculous. Addiction is a nice string, but for someone like me with heavy pace and spin, not worth the cost.
Setup: VS / Addiction @ 57
Racquet: Tecnifibre 320 VO2
The Mercy Kill:

It was just a standard synthetic gut, Prince Synthetic Gut Duraflex. About $6 or $7 for a full job not in a reel. Syngut lasts me about 3 hours, tops. I rarely use it these days. It was strung too tight for my tastes anyway (they were in there when I got the racquet). The Vantages are my backup racquets or for when I need something a little more arm friendly, so it had to go. 30 backhands and 1 forehand shot to finish it off.
Setup: PSGD @ 60
Racquet: Vantage 321