I second what Vogon had to say, as I ran an ALICE belt rig (and LBV-88, for that matter) for about a year and a half out of my three years of airsofting, and still use the belt as my first line gear under my vest. It lasts as well as high end replica and real plate carriers, but it lacks the cool factor. However, if you get a replica plate carrier, I recommend Pantac over Condor, as it lasts much better.
I must also second the good boots suggestion, as boots can make a huge difference. I personally recommend Danners first, then Belleville, then Bates, then Altama. I recommend spending at least 90$ on a pair of new boots, as cheaper ones break down pretty badly.
Good eye protection is also important. Bad goggles fog and make for a crappy day.
Camouflage can be whatever you prefer. Woodland is cheap and effective.
As far as guns, I choose brands based on the gun. For M4/M16 series weapons I recommend KWA wholeheartedly. I have abused mine, and barely had any problems with it in almost a year, and it still works great. I used to have an Echo 1 M4, but it was not durable enough for me.
For AK type weapons, my friends have had wonderful luck with JG and Echo 1. They are tough, and cheaper than heck.
What sort of loadout are you looking to emulate, if any?