I just moved to Lake Travis from Calif last month and Lago Vista was tempting but it's still pretty remote. The nearest real grocery store is about 20 minutes away. In 5-10 years it'll probably be much more developed but prices will probably catch up to the rest of the lake too.
If you're "retiring" Lago Vista could work easily and it's definitely the best value in waterfront on Lake Travis. Be sure to do your homework on the floodplain and the lake's widely varying level.