The VTF-2's closest would be the PB-10, but the PB-10 easily goes lower than the VTF-2. I had them both at the same time, and for the price, I'd go with the PB-10. The VTF-2 is an excellent sub, but the PB-10 has enough extra to edge it out IMHO, and it costs less too.
The VTF-3 would likely be closest to the ISD/V as you mentioned. I know of one comparison of the PB-12 to the STF-3 and the PB-12 came out on top, but I think the VTF-3 might edge out the PB-12, but the ISD/V might be a closer match. Either should sufficiently impress most people.
How big is your room?