Most of the important factors have been covered. Look at your area of operation and apply common sense.
For instance... if you're running or contorting your self a lot (read urban environment) then you might want to avoid subloads and other crap that will be ripping up your legs as it bounces and chafes!
If you're going to be prone a lot, then subloads are cool once you figure out how best to situate them. At the same time, you'd want to avoid the bulky front/chest/belly mounted pouches that are going to make it uncomfortable and awkward to be prone.
If you're just looking for general use gear, you still need to remember that you get what you pay for. I'm a huge Tactical Tailor fan, haven't had any of that gear fit badly or fail. Eagle is next on that list for me, followed by HSGI and SpecOps. I personally stay away from Blackhawk brand or blessed gear because it really isn’t made as well as implied and I don’t like wasting my finite funding on crap gear.
Remember as well that just because you can do something, doesn't mean that you should. If you're getting a plate carrier and plates, that stuff alone ain't very light. Add ammo, water, tools, knives, aid pouch, flares/strobe. commo and other basic sustainment and you end up with 50+ pounds of gear (haven't weighed mine because I know that bitch is heavy) to start. That doesn't count a typically over loaded pack and secondary sustainment gear.
I'm set up so that I have my side arm, fixed blade knife, 4 mags (2x2 pouches), dropleg panel w/ holster all on a separate belt. The Plate carrier has the 10 AR mags, admin pouch and hydration. This way I can be without the chest rig and still have my side arm and not have to change up the side arm holster again.
When I need to move cross country or shoot long range, I opt for a traditional LBE w/ a minimum of gear attached. Been eye’ing a few waste packs, but the LBE (good old USGI issue) has always been there for me and I know it is not going to fall apart on me in the field.
Just again remember, gear up for where you are going to be using it. Don't buy Woodland cammo if you live in the desert, don't buy black unless you think you're a fricken Ninja or are planning on doing a personal cammo job on it. Yes Nylon likes Krylon, I just don't advise it.
This is my personal opinion and drawn from my personal experience... take it with a grain of salt and do your research. The net is a good place to find gear opinions... but they are all just opinions. You will have to decide what your budget and preferences are.