Good points all around, still though I don't own many champions at the moment and I'd like to own a carry. I think Twitch will suit my playstyle and singed has been a very reliable back-up for me. Allistar and Veiger are distant seconds... I stopped buying level one runes once I realized there were level 3's and how expensive they were. I am looking forward to Dominion though, should be an excellent change of pace. Can't wait to leave poison trails around the capture points.
I cant wait to booby trap capture points with mushrooms. Twitch is a good choice, though I can't really decipher what your playstyle is from those champs you said.
I like to play aggressive, but with options. With Singed I can push the lane pretty hard and have viable options with escaping. I use cleanse and ghost as my summoners. If allows to make clean getaways or chase people down. With Twitch, I want to play a little bit more stealthily and set up ganks. Again still aggressive, but with flash and twitch's ambush ability I can still make some clean escapes. I won't have the escapability of singed, but I'll also have the damage output needed to take people down quickly.
I play occasionally (summoner name: Ser Poptarts) I rock Morgana and Malphite. Been saving Ip for Nocturne though. Almost there. I'm only level 11 as well.
Never played Nocturne, never really thought he would fit my play style. I like to get a quick kill from afar, hence my love of Kog'Maw.