I just bought the Alta Pro 263 and it seems nice ... I plan on trying it out this weekend. It certainly seems steady and I even pushed down onto the extended tripod to see if there was any flex and the legs held steady. It was between these legs, the Manfrotto 055 series and even looked at the Giottos MT series legs that someone here on the forum suggested but went with the Vanguard legs since it held enough weight, had flip locks for the legs, came with a rock & carry bags and to save some money. Every review on these legs was very positive so I figured I probably won't go wrong with them. The height without the center column extended is about 52".
I didn't buy the SBH-250 head, I bought a Benro B-3 head though since it is supposed to be 100% Arca compatable but that ball head has gotten very positive reviews as well.