Ichigo isn't the man for Rukia IMO. He is a rather simple individual who always shows what he feels and does anything he pleases without thinking of consequences.
Rukia however does not show her TRUE emotions often. I take her as a rather complex character who would take time to really open up and feel and i highly doubt Ichigo is capable of that. Caring, yes - bt IMO they'd make a horrible pairing.
Going from that, I feel Orihime is much better match for Ichigo.
I do support certain pairing, but I'll keep it to myself (it's none of the above).