Hiking, Scrambling, Mountaineering, and Climbing

Vasque make a nice leather boot.

raichle, la sportive, one sport, hawkins, mammut, zamberlan, asolo, hanwag, lowa, more here > http://www.buachaille.com/c0-1-0-0-0-1/2-3-Season-Hiking-Boots/

any recommendations for decent leather walking boots ?

Not to be a pain but to use an analogy that a cyclist will understand, that's sort of like asking 'can anyone recommend a good steel bicycle'.
What do you want to do with them? Day walks in summer, on trails or cross-country, 3-4 day 3-season backpacking, winter backpacking in snow and ice?

Any suggestions for good summer hiking shoe's will be travelling around South east Asia for a few months?

Lightweight trail-runners are awesome but on technical/scrambly trails some models twist too easily, which is quite unnerving when edging along a ledge or balancing on sharp rocks. So for off-piste backpacking I'd pick something with a stiff sole - if you grab the toe in one hand and the heel in the other, twist it, and if you can get it more than maybe 60 degrees twist I'd leave it (unless you're walking on well-maintained trails only).

Lae makes the best point,

But as you mention Meindl, I love my Meindl Kansas GTX. Got them in the sale so they're most likely last seasons version. Cracking boots so far though.