need advice: cross-drilled, slotted rotors, lots of questions. Options

[Zimluura]

i need to get some advice on drilled + slotted rotors.
from what i've read on here before it seems like slotted is good. but cross-drilled is bad (leads to cracking allot)

i've been warping rotors allot. so i think i should try to upgrade to better ones. my mechanic says he found some that are cross-drilled and slotted, and have a lifetime warranty. i think they cost something like a 120usd per rotor.

lifetime warranty alone sounds worth the money. is there any chance that the cross-drilling isn't going to lead to the rotors cracking?

also, do performance brake rotors wear your brake pads down quicker?

thanks in advance
ny

[Zimluura]

according to wikipedia cross-drilled brakes are for looks and weight reduction. but it also mentions them under the cracking section.
http://en.wikipedia.org/wiki/Disc_brake#Cracking

i always assumed it would help with cooling, even though it's less mass, it exposes more surface area to the air. like why heat-sinks on chips have fins instead of being a block of metal.

still sorta thinking about it 'cause of the lifetime warranty bit.