I'm a big fan of the mid 70s to early 80s Yamaha classicals with solid spruce tops. It's very hard to find a Yamaha from that era that's bad. These would inlcude:
From the 1970s:
G-255S
G-250S
G-245S
G-240
G-235S
You can see and hear most of these guitars at my blog post here:
1970s Yamaha Classical Guitars