The original will rise in value, the replica probably won't. If the original need filter caps, so what, have it done and be good for another 40 years. I haven't heard a replica yet that sounds as good as my 65 Princeton Reverb.
Fender is thier own and everybodies worst enemy.They built 100000's classic amps that are still going stong and are tone benchmarks. And they are cheap! a Blackface fender should cost 3000.00 and i could buy 3 for that much any day of the week.witness-64-super 800.00-64 vibrolux 875.00-last year.
the advantage of a QUALITY replica is that where the original has components that are still OK but have drifted off original spec over 40 yrs., the replica can be "blueprinted" with matching components. I have a blueprinted BF Super circuit built by a friend who's a well known amp tech and it is incredible, I prefer it to my 64 VR (and when I mentioned this he pointed out the issue of newly matched components v. 44 yr old ones as a reason why that might be the case).
Anther oft overlooked variable is WHICH original? There was so much variance in amps from one to the next back then, that almost no 2 sound the same. Some were stellar and some sounded like ass. Most were somewhere in between. You also have to factor in component drift and the fact that they drift in different directions from amp to amp.
I have a '65 Twin that sounds better than any other I have ever played. I have a '64 Deluxe Reverb that sounds just OK. I'm sure if I went through it and swapped some caps, resistors, and transformers, I could make it great, but then it wouldn't be original anymore DonR has a '66 Deluxe Reverb that sounds pretty average as well. I've heard better than both of ours. He has a 70 something silverface DR that sounds better than both of the black faces if you put a 5Y3 rectifier in it to equalize the voltages.
Then he has a '51 Deluxe that is the best I've ever heard. He also has a '65 Princeton Reverb that is just average.
Don't you think this applies to bootiqe amps?judging by all the %by this and mary ann's on the emporium i bet they are sometimes not all stellar even with modern spec'd parts.As far as i can tell the last lasting "benchmark" tone after the classics(tweed,blackface,ac-30'plexi etc...)is old Howard Dumble and it's mostly us tonehounds that really know it's what we dig about a couple guitar players guitar players(ford etc..).
Choice is great but there is the real deal and they are still available pretty inexpensively.