I think you have 2 major choices:
a. Siege and Evil Siege
b. C-System 3.5 and 2.5

The C-SYstems have very strong backends, so if you're into control or need more control, you may be better off with the Sieges. ALl 4 have a strongish mass biases like your Zones.
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"None are so blind as those who will not see."

You really can't go wrong with going with the Sieges or the C Systems. To compare the Siege and 3.5 the 3.5 is a stronger ball over all. The Evil is much smoother than the 2.5.
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Corey Clayton
Brunswick Amateur Staff
Turbo Grips Staff
Team Canada 2007, 2008, & 2009
All my equipment is professionally drilled by Rich Huzina at Strikes Pro Shop, Let's Bowl Calgary, AB
The opinions expressed are solely those of the writer and not of Brunswick Corporation

BrunsPedro, if your brain was "Made in the USA", then I'm all for Brunswick making their bowling balls in Mexico.

If you are just bowling on a THS I would recommend the Wild Card and the Wild Thing. They are much more driller friendly and are great balls. I have both and also both the C Systems, I find that these would much better on lower volumes.

I have told several people that, for me, the Seige and Evil Seige are very good and compliment one another very nicely.  When I am throwing the Seige and the shot starts to go away a little, I can go to the Evil Seige and have virtually the same look and roll.

I have tried many balls that are to be "step downs" from solid to pearl and they were very different.  Not so for my Seige and Evil Seige.

Now, saying that, the Evil Seige is still a lot of ball and when the shot continues to transition, I usually need to know when to put it away and go to something weaker.

Hope this helps.

Scott