LJ100 is definately a quality extract, but I wouldn't say it's the only legitimate/useful tongkat ali extract. For example, there are many studies using Physta (0.8-1.5% eurycomamone).
As for ingredients that have research supporting their use here, I'd say that the following are my personal favorites:
-ashwagandha (standardized for withanolides)
-tongkat ali (standardized for eurycomanone)
-forskolin
Besides just boosting test, these ingredients have research supporting other benefits, ranging from increased LBM and strength and improved body composition to reduced stress and anxiety.
Alphamax XT has all three of these ingredients at effective, research supported doses, as well as some other nice ingredients (those three just happen to be my favorites).