[Perfectlap]

new wheels and tires won't affect the handling after an alignment.
At what speed do you feel the vibration?
I get the same thing around 65mph but I put it down to some flat spotting on my tires.
You do have to keep in mind tha a more responsive car is also a more sensitive car and you'll feel imperfections in the road in a much loud and clear way then you would driving along in a 4 ton sedan.
I suspect there is some suspension maintenance needed in your car if new tires have been mounted and your alignment was recently done. I doubt its the springs and shocks, when those go the symptoms don't really seem like what you've described. could be a bad wheel bearing some where.