Dara Obrien... saw him in standup and he was excellent.
Rich Hall... His fishing show was fantastic as was his cattle show. of course as it wasnt licked by ricki gervais the beeb ignored it and threw it on bbc4 in a graveyard slot.
Dylan Moran... Proved his salt in Black Books and in a recent interview said he was working on a number of ideas.
Boothby Graffoe... Maybe not a sitcom... but rather something along the lines of Mark Steel. Very funny guy with some great songs.
i can't really think of any who should get a sitcom but for the love of god someone stop giving them to ardal o'hanlon! love father ted and his stand up but... and i don't think dara o'briain would work well in a sitcom, he's funnier with off the cuff material