Out of all the Gen's, which one is the best bang for the buck

[Troublemaker]

love them all.

Excluding the new ones I would order them
Gen 1
Gen 3
Gen 4
Gen 2

For me, I became a Viper fan the first time I saw a gen 1 on the street.

Love the Gen 2, but I think Vipers should have side exhaust. The new ones look like the gen 2 but have the side exhaust too. so it is close to perfect in my eyes.

If side exhaust is what does it for you, it's not very complex to put it on a Gen2,