In reply to alexrumsey:
I spent 2 weeks in Slovenia last summer and had a great time. The mountains aren't that high (the highest one is around 2800m), but the benefit is that you don't need to acclimatise. There is a good variety in difficulty,some of the 2000m+ peaks are simple walks, others require some scrambling and there are quite a few with via ferratas up them (gear can be hired in Slovenia).
There are lots of mountain huts and depending on what you want to do & the weather you can do day walks up peaks near the road/towns or walk for days/weeks, staying at a different hut each night. Public transport is quite decent and the costs are generally slightly lower than in Western Europe. Most people will speak some English, although I found that in the mountain huts many custodians spoke much better German than English.