The ACL Race Series of bearings is Tri-Metal and is what we prefer to use in most of our applications (when available). You can also get them in std size with .001" more clearance, helps for oiling.
ACL also has a few other grades of bearings that I have seen other shops use and just say "ACL". I have never used these bearings and can-not comment on them, as we have done all the research on the ACL RACE series.
http://www.aclperformance.com.au/prod_e_bearings.htm
We also like to use the KING bearings. They do not offer a "race" series for the import motors at this time, but they feature a tri-metal design as well. Now before people get worried about the KING bearings, they are what I use in my car
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http://www.kingbearings.com/advantages.html
Our stage 1 motors come with Kings, stage 2 and up come with the ACL RACE series. The price is the same on both of them, so you can opt for one or the other, but they are the ONLY 2 bearings we will build motors with.
Another interesting fact, Toga bearings are just re-labled King's. We have figured that out on a few Nissan Motors.
If anyone needs engine bearings let me know. The Kings and ACL's go for right around $85 for a complete set of connecting rod, main, and thrust washer/thrust bearings. We've already done all of the hard work as far as research is conserned, just have us take care of you the entire way
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About Clevites...they were top of the line many years ago, and many people have refused to switch from them. We personally believe that the markets change for ALL products and are always trying to improve our product line. We refuse to get stuck in a rut when it comes to a perferred manufacture. When the Clevites started to show up with burrs everywhere and just looked like the tolerances have went to crap, we dropped them. (This was back in 2004).