Looking for some advice. I'm considering the purchase of a NAD 3140 and NAD 2140 combination. This would possibly replace my Marantz 2225 and link to either 4 KLH model 17's or 4 Dynaco a25XLs. Any thoughts on whether I will love the NAD equipment? Is it reliable (circa approximately 1985). What should I watch for at the audition? Thanks