There are literally dozens of excellent knives that fit your description but I'll give you a few to take a look at by some major companies.
If you liked the mini manix you really owe it to yourself to give the manix 2 a shot. Its an update on the manix platform and features the caged ball bearing lock with functions similar to the axis lock. The native 5 is a g10 full flat ground s35vn version of the native that many people have compared to the mini manix in terms of feel. Also with similar ergos is the sage series which is available in several different handle materials and locking mechanisms. The sage series is made in Taichung Taiwan which is known for producing the best fit and finished knives with a spyderco logo. The taichung knives truly are world class and perhaps the flagship of those knives is the Gayle Bradley. The GB features materials (carbon fiber and cpm-m4 blade steel) and fit and finish normally only seen in knives costing several times more than the gayle bradley's $140ish price tag. Cpm-m4 is a high tech powdered metal tool steel with nearly unmatched edge retention as well as a very high level of toughness. M4 is commonly used in bladesport cutting competitions. Keeping with spyderco, the paramilitary 2 is a spectacular knife and a forum favorite. The compression lock is extremely strong and incredibly smooth and the egos are top notch.
In terms of benchmade, pretty much their whole production line fits your description so I'm not even going to try to list them all, but a few personal favorites and other popular knives you should check out are the 710 (its a classic), 950 Rift, 940/943, 810 Contego, 746 Mini Onslaught.
Zero Tolerance, Kershaw's high end hard use division has some excellent knives as well, although most of them run $200+. The 0350 and 0200 are the exception and are available for under $150. The 0350 is a beefy assisted opener that carries surprisingly well due to its thin profile. The 0200 on the other hand is a manual flipper and a beast of a knife.
Good luck on your search, like I said, their are literally dozens of excellent knives out there, my list is just the beginning, if you can tell us a few more specific features you're looking for we can give you more specific suggestions.
