Personally I'd say go with something that has decent support and instructions. Look through the list of popular models on the wiki. A good place to ask delta specific questions is on the Google Group for it here: [groups.google.com]
On the Google Group I see a lot of talk about the Kossel Mini. Not something I'd personally go with but seems to be reasonably popular. A slightly easier to build (and source for) is the 3DR however I believe it has a slightly smaller build volume (although its likely very easy to scale the height, not so much the width though).
Or you could go all out and build your own from scratch. After building my i3 I chose to do that. It's challenging but highly educational :)
On the Google Group I see a lot of talk about the Kossel Mini. Not something I'd personally go with but seems to be reasonably popular. A slightly easier to build (and source for) is the 3DR however I believe it has a slightly smaller build volume (although its likely very easy to scale the height, not so much the width though).
Or you could go all out and build your own from scratch. After building my i3 I chose to do that. It's challenging but highly educational :)