First off, LBV stands for Load Bearing Vest (pretty close guess). It pretty much means that when you balance it properly, all the weight is distributed evenly.
The LBV I'm assuming you're seeing is the standard USGI one;
I'd like to note that for you to achieve more then mag capacity, you'll need to purchase a belt and pouches along with this vest.
If that's not you're style and you'd like a modular vest (like the one you pictured), I would suggest shopping around and trying different styles. There are some good cheap ones around, but most modular vests under $100 are absolute shite. Go to your local surplus store and try a few different vests/rigs on, see what you like.