downside is that alot of the highgain amps starting to sound kind of similar
Go play a bunch of different Marshall Hi Gain heads through the same cab in a music store and you'll notice the same thing, they all sound similar, and even more similar if you mike up the same cab using the same mike and record them.
The problem is we're getting too spoilt around here, we've got ourselves a collection of Marshall amps we could never dream of owning, we can't use them all, you have to choose & select just a few.
Good idea to try use different cabs because that way they don't sound similar, each one will have a unique tone....kind of like if you own 5 Strats, no point in having the same pickups in each Strat, you need to use different pickups to make each one unique and different.