Guns and ammo tv gave a pretty rave review on the high point carbines. I would like to shoot one
The only two bad things I hear about those are they are ugly and they overheat if you shoot them too much. But casual plinking they are a good deal.
I like my PSA AR-9. I replaced the upper with a Spartan Tactical to get the LRBHO. It works well, but as stated upthread, depending on the magazine spring tension, it may not STAY open. YMMV.