Just a few lines about the popular (and quite expensive!) "Champions Choice" string job - a hybrid of Wilson's own gut and Luxilon's Alu Power Rough.
Of course Roger made it famous. Like a few other top pros like Novak and Andy, he has the gut put in the mains for power. If you want to prioritize spin, you'd put the Rough there (since the racquet head mostly brushes up on the ball sideways).
I've had a few hits with it, mains in the crosses, and can confirm that it gives a bit of a power premium over a full bed of a poly. Maybe 10-20% based on your poly? Other playing characteristics were alright. Didn't get the impression that it could keep up in spin production with the likes of the Hyper-G, Cyclone, and surely not the Tour Bite.
While these days, you usually cut out polys before they break, the Champions Choice job says goodbye somewhat quickly, especially on surfaces like clay or HarTru. Would give it somewhere in the range of 5-10 hours. So that adds to the expense.
If you'd like to mimic Roger's setup, note that he still uses Power Pads (leather inserts) on the throat grommets and even puts in a few string savers slightly north of the sweet spot...
You can probably save a bit of money and get similar results by buying another proven gut and pair it with the Tour Bite. I read somewhere that Ana played a setup like this for a while.
Personally, I've tried and tried, but putting 2 different strings in a racquet is just not for me!