From my evo 7 to a Gtr was an enormous leap. They feel better, drive better, handle better, and aesthetically better. Intially, I thought gtr's were poor at handling (weight) but I was wrong. A gtr is not the ideal car for drag (rather a 2JZ is preferred) unless that's your goal of course. You can unleash lots of potential from the rb26 but is very costly.
Overall though, they are still quick from stock but before you know it you will want more power because the car screams for more. As your probably aware it all depends what model 34 your after ie. base, vspec, vspec II, mspec and nur spec variants.
The 34's that I find hold their value are either black 34's, or vspec II and above.