Ninja regs & tanks are very popular. Carbon fiber is the way to go. 50/45 is good for some & not for others. It really depends on your overall size & what you find comfortable. I've never owned one. Try playing with one on your setup if that's an option. Or at least screw it in to see if it's comfortable.
Some Invaluable Words of Wisdom:
A wise man's heart directs him toward the right, but the foolish man's heart directs him toward the left.
“If you're not a liberal at twenty you have no heart; if you're not a conservative at forty you have no brain.”
-Sir Winston Churchill
"Lousy Democrats."-Homer J. Simpson