Just to go back to the practicality issue, I notice you've got a SCAR H and a Desert Eagle. If these are your main guns then they will most likely dictate what pouches/holsters you can reasonably use. You certainly won't be looking at things like a Recon Chest Rig for example (they're generally only compatible with 5.56mm mags).
There's LOADS of surplus desert kit floating about out there for very little money so maybe start with a DDPM UBACS shirt and trousers. Over that I'd look for a tan MOLLE chest rig or plate carrier so you can start finding mag pouches that will fit. Duty belt to hang a holster from (separate from whatever holds your trousers up), plus the holster (ask Black Death which ones he uses as I believe he dual wields DEagles).
Also - boots. If you're wearing trainers now, look for decent lightweight ones otherwise your legs will die after half a day! Meindl Desert Foxs are good and light and gettable for about £40 surplus (not waterproof mind).