If someone were to ask me what he or she should get, I'd just say get the V2.
But, at this moment, if I were to be given a choice between having a V1 , thoroughly worked over (within the confines of reality and what is currently available), or a V2 to play with, I'd pick the V1. Yes, they are two totally different animals, but the animal of my choice would be the V1.
The V2 just seems to have become more of a boulevardier, which is, by no means, a bad thing. It's more refined, more matured, and more substantial (especially in heft), but can still rip you a new one. I'd definitely rock one to romp around in. And it's been polished up a bit to the point where it seems it'd be happy doing duty as either a civil transporter or a raging mad suicide bomber (I felt the V1 was always more happier being let loose as the latter).
But on the V2, other than to just coax out even more guffawing amounts of power, beyond that, whaddaya gonna do? My main goal would be to shed some weight on that pig, but then I might as well just start with the V1. I think you could readily get a V1 up to and beyond the performance levels of a V2. I think.
Yes, you'd obviously have to forgo the amenities of the V2, but for the purposes of a fun car, I'm cool with that. The V2 is the better all-around car. And that's why I'd readily recommend that, of the two, if someone else were to inquire.
So, really, you need both. A thoroughly worked-over V1 as the raw single-minded performance machine. A V2 as the bi-polar silky smooth cruiser / bomber missile.