I have gotten the opportunity to purchase a 1972 Acoustic 320/408 stack locally for $600. The reviews are stellar, I have some concerns though. It is only 300 watts, I know that watts don't always mean loud but usually they're a pretty good way to estimate. Also I worry how long it will hold up, It already has nearly 40 years, how much longer could it last? Lastly, I wonder if the price is fair. So could anyone give me some information to help me in my decision? Thanks in advance.