I think we should focus on Revelate for a while as it is not fully done. If you do plan on buying another group though, maybe a group based mostly on coding or se'ing? If not, maybe a graphics group? I would give you suggestion that fits what I want(Since I planned on buying one but don't use BTC), I was looking for a group based on Manga or possibly a media group of some sort.
Though I have my preferences, I'll support and help you out with whichever you pick. If you do happen to buy another group, hmu and I'll help you out with ideas and such.
And if you decide not to, also let me know so I can ask you a question.
So my final thought, I would get everything sorted with Revelate first. But as we need more groups, I will never say no to a new group.