I've been on the top of Conachair and it is a fantastic summit in a fantastic setting, but my favourite so far is the Sgurr on Eigg. Im not really into the hill lists or bagging, though I certainly see the attraction and do get dragged into it on occasion
In the sub 2000 category my goal is Boreray, I think it is going to be really difficult and expensive to achieve but doable. It's the ultimate goal for me alongside Ossians cave, but that's a different story.