If you want lightweight then you could also consider using a battle belt instead, it keeps you cooler than that plate carrier will. You have the mag pouches to the sides on your hips and then room to the rear for dump pouch, etc, depending on what type of pouches you choose. I use one and have no problems laying prone and changing mags, and like all kit it justs needs some practice to get familiar with positions of pouches and mag change drills.
This is the same as mine at £50, although I used a discount code to get between 10 and 20% off - http://www.uktactical.com/p-8712-warrior-plb-belt-olive-drab.aspx
Not sure if Ranger Green is darker than Olive Drab.
This is an example of a fully filled belt - http://www.uktactical.com/p-10356-warrior-belt-mk1-utility-combo-olive-drab.aspx
The Gunfighter belt is above your price point but I would say the best option if you go down the route of belts - http://www.uktactical.com/p-11541-gunfighter-belt-olivie-drab.aspx
Anyway, more options for you if not actually answering your OP, and no sling point.