To me, balance is better than weight. Heavy and unbalanced is far worse than heavy and balanced. Yes, a seven lb rifle will feel lighter than an eight lb rifle but an unbalanced, front-heavy seven pound rifle will feel heavier than an eight pound balanced rifle. If you put a heavier stock (than your current one) on your rifle, it will likely either balanced it or make it a little back heavy which is better than being front heavy. Unless you're intentionally trying to make the rifle as light as possible, a slightly heavier stock is not going to be detrimental. Obviously, you don't want to run around feeling like you're carrying a Flak 88 on your shoulder all day.
On a personal experience, I found this to be true and even found myself fumbling with my support hand when wielding rifles with light-weight oriented stocks, but when users of those rifles picked mine up (Also had a B5) they were impressed on how light it was considering that it looked 'bulky.' That being said, take a look at the Magpul STR. It may have what you are looking for in the stock, sacrificing a bit of weight while maintaining that natural cheek-weld, balance, and look of the B5 without breaking the bank. I found that peering through a 1x4 shorty was a lot easier with the STR than it actually was with the B5.
What is your current build, just out of curiosity?
Final thoughts: YOu do you, man. Obviously, the final decision is yours and yours alone to make.
