To validate a new analytical tool, I would like to test it on a very well supported, robust phylogeny for which all the DNA sequences are publicly available. What is the best phylogeny available?
If is useful for you and close to the organism that you work. There is a group that work specifically phylogeny of bees. They have published many papers about the phylogeny of many family of bees. But there is one paper that is the sinthesis of all the studies. The phylogeny is well supported, they are the maximun experts of bees and all the sequence are available in internet. As you could check in the paper. The paper is from Danforth.
I would suggest determining this yourself; it would be just as valid and would help you make these decisions on your own. If a phylogeny is well supported it is because several different methods give the same results. Try Maxumum Likelihood, Neighbor Joining, bayesian analysis and neighbor joining on a group which has a well supported core and some questionable relationships.
The only way you can do better is to have a group with well supported fossil evidence but a questionable molecular phylogeny. This may exist in the vertebrates or the mollusks but I don't know.