1) Gitzo GT1541T + Markins Q3T + the RRS quick release plate
2) Gitzo GT2531 + Markins Q3T + the RRS quick release plate
I bought setup (2) first, and just got the 2nd set of legs - still only one ballhead - for backpacking overseas, as it will fit in my day pack.
Weight-wise, both tripods are about the same, but the traveller is definately way more prone to vibrations, and less stable in bad weather as the bottom leg sections are very thin. The 2531 is a rock - glad I got the 31 instead of 41 version however (3 versus 4 - leg sections), because chunkier legs = more stable, from experience now with the traveller tripod.
The Markins ballhead and RRS plate are awesome, fit on both tripods well, but the 2531 base fits the next ballhead size up too.
I currently use the tripods for landscapes and macro - both go down to 17cm + BH + camera. I'm on the lookout for a 2nd ballhead so my hubby can use a tripod at the same time as me, but he doesn't need a fancy one.