I was thinking of the mk17 with the g250. why is the mk25 your choice? And the octo has been driving me nuts. I had been looking at the scubapro r190 but it just didn't seem right. I have also been looking at the aqualung titan lx regulator. It seems that scubapro has the field on regulator though.
The MK 17 is an excellent first stage. Paired with the S600 or G250V, it's a sweet breather. I prefer the MK 25 because the LP turrent swivels, and it has five LP ports. I currently dive MK 25's with S600 and G250V second stages. I have R295 Octos on both, and they are more than adequate. almtree: Bob