I've been running Blue Groove/Nevegal combo in 2.1 with tubes for a couple of years. For Lakes, trail centres and Spain it's probably a very good set up. Have gone through a couple of Nevegals on the back partly due to not having the bead sitting correctly.
Blue Groove is great for rocks and hardpack and general speedyness in the dry. Be warned though it is a TERRIBLE mud tyre, just washes around and clogs up in the gloop. The penny dropped when I switched to Nevegal DTC Lite 1.9" (i think) for the winter mud, front and rear.
My Blue Groove will come to Spain with me again this year (though it is getting to the end of its natural), to answer your question, for a general fire and forget all round tyre I'd go 2.1 Nevegal front and rear.