Hi Ian,
I'm getting ready to start up on a big Tamiya Viper ......Block 50 kit .....building a Block 40 from Hill AFB ....Black Widows OIF bird.
Of course the Tamiya kit is gorgeous ...... does not need much in the way of upgrades, though there is stuff out there.
I have a couple of the Academy kits .....both the single seat and the SUFA kit ..... the knock on those being that the intake is not "right" in
the way that it matches up under the forward fuselage. Zacto Models make a replacement if you are looking for a small mouth intake that corrects
the issue. Not sure if he will eventually release a large mouth intake correction.
The Academy kit seems to build up into a great rendition of the Viper though for me personally, I would take the Tamiya for a single set build and
the Academy with the intake correction for a dual seat build. I also hear that the Aires wheel bay set fits the Academy kit nicely, while their Tamiya version
has fit issues that you will have to deal with if you want to use it.
-Scott