If you have a chance to get one at a reasonable price, I probably would, as in your case, if I didn't have one. But you also need several extra mags and some quality ammo. Most any of the run of the mill AR-15's will do fine for the average person. The Bushmasters, Smith and Wessons, Rugers, Rock River, Olympic Arms seem to be really popular around this area. I'd stay away from the import stuff like the century arms or whatever. I've owned just about all of them at one time or another and they were good quality rifles. The key right now, is to get a good rifle along with at least 6 to 10 quality spare mags and good quality ammo. I tend to stay away from the Russian Ammo for the most part, though some here on this forum may have gotten good service out of the Russian stuff. I had big problems with Wolf. I like the plain box Winchester or Federal. I've shot thousands upon thousands of rounds out of Bushmaster mags with the standard green followers and they all operated well, including in some full auto rifles I've shot.
The main thing here that I've found is not to get too wrapped up in the marketing and hype. Everybody's got their favorite brand and everybody has an opinion. Ask people who've fired them a lot and actually tested them. Get a good solid rifle, good quality mags and decent ammo and it will do whatever you need it to do. There's nothing that says you have to have a Les Baer AR and MagPul Mags to be functional. I went through one of the muddiest, wettest, nastiest, sweatiest, dusty, sandiest SWAT schools I have ever seen with a standard Bushmaster and standard mags right out of the box. The only modifications was an EoTech Sight, and a short rail on the forend to mount a light. It shot extremely well and never hiccupped through over 2000 rounds. My partner bought a new Smith and Wesson AR and did the same school. The only thing we did find that gave anyone trouble, is when some guys started adding too much stuff in add ons, special bolts, special super-duper spring kits and followers. Another thing I see, is people that buy a great little rifle and load it up with Cheap Chinese crap for accessories and optics.
If you want a good rifle then get one. If you add anything, make sure it actually serves a true purpose and is made by a quality company. Some of the people that added on so much Tacti-cool stuff, never really needed or used it and got hung up on more brush and fences and stuff, and had more malfunctions than anyone.
It's kind of like Glock pistols I've used. They all ran like a clock and were excellent pistols for an intended purpose, until somebody put it a special "tactical" Match Barrel, with the "Tactical" extractor, "Tactical Match" Spring kit and anything else that was Black, Camo or looked cool in the movies. That's when the problems began.