Zap-a-gap is what I have been using. They make a larger bottle that has two caps. The nose of the bottle is not tapered too much so you can cut it back once it gets too clogged. Typically a needle helps unclog the tip. You can get it at a local hobby store for model building.

I just picked up a new bottle of Krazy Glue which claims the tip will not clog. Its using a new bottle and cap design too. I'll let you know in a week or so.