Cpdunn99, did Chris Barry play Martin Stephen (and the Dainties, I believe) for you? Just wondering as I remember that record from a long time ago and will have to find it again as it is a good listen for sure.
I recommend: The Bad Plus, (I may have spelled Plus wrong) but this is one jamming jazz trio with piano, bass and drums that is very dynamic with lots of talent and a little alternative. This group is hard to describe but if it sounds like maybe your cup of tea you should give it a listen as my description is not doing it justice I promise.
BTW the Bad Plus may not meet with Ben Campbell's criteria of an obscure group, but I am not very familiar with the critics and/or publics opinion, just my own (and they seemed obscure to me), and feel these groups are worth a mention.