I think 1DHEA probably has the best research for it right now and seems to be having good results from people using it.
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It would probably be good for a first time user. Although I'm very curious about 1,4DHEA too, I haven't tried it, nor seen any feedback on it to tell whether or not it's worth the price.
Incidentally, I just bought a product called Yeti Resurrection oh phwsupplements because I'm trying to kill my liver. It has every PH and DS in it known to man, and although I definitely wouldn't recommend it to a beginner, one or more of the ingredients in there is something else you might look into for your first cycle.