Why get a removable carry handle?  If you end up putting a traditional scope on the rifle, you’ll probably want a good flip-up BUIS (like the ARMS 40 or 40L).  If you think you might get an Aimpoint or other dot sight, a fixed BUIS (like the LaRue or LMT) might be a better BUIS choice.  You’ll spend nearly the cost of any of these BUISs with the removable carry handle.  My advice is to skip the carry handle.  

Get a chrome-lined barrel.  It will last longer and clean up easier.

Go for a 1:9 twist if you think you’re gonna stick with 55 or 62 grain ammo.  Some of the heavier bullets will require a 1:8 or faster.  The 1:9 should last a bit longer than the 1:7 barrels.  That said, you’ll probably never shoot-out a 1:7 unless you shoot a lot.

Being so close to the AWB sunset, I couldn’t recommend any muzzle device short of a good flash suppressor.  If you ever shoot at night, you’ll know why it’s a good piece of equipment to have.

Stay away from the HBAR barrels.  IMHO, the thinner profiled barrels are a bit easier to handle in the field for long periods of time. YMMV.

So you want a Rolex.  Well, I’ve had some very expensive watches and some inexpensive, but good quality, watches that all kept time.  A Colt will cost you more and will have a better resale, generally, than most other ARs.  The Colt guys will be along shortly to proove exactly why Colt is so much better.  Truth is I have Bushmaster, RRA and Eagle Firearms ARs (some factory and some built by me) and they ALL run great.  IMHO, I think RRA is probably the best bang for the buck right now, but won’t have as high of a re-sale as the Bushy or Colt rifles.  If all you want is re-sale value, get a Colt or a Bushy.  Personally, I don’t think much of re-sale on my ARs because I buy them with the intention of keeping them.  YMMV.

It will be legal to own the LEO-only lowers.  I do, however, think you’ll be asking for trouble from most LEOs who won’t understand the law.  Just MHO.

Welcome to the black rifle addiction.

One more thing.  After the ban sunsets, get a barrel that is threaded.  Nothing permanent is good on these rifles IMHO.

Ridge brought up a hell of a good point I hadn't considered.  Immediately after the ban the LEO-stamped rifles might be the only complete rifles.  I probably didn't think about that because I build all my lowers and usually buy complete uppers.  Very good point though.