Can't limit my list to just two, but here's mine:
Lynx BOOM BOOM - my first "real" driver I got in HS. I had a women's persimmon model I got as a kid before that, so it was like night and day.
Callaway Great Big Bertha Ruger Titanium 8* - first Ti driver that I used, and I hit it all through college when I started getting really serious about golf. That thing was a cannon.
Titleist 975 J-VS with an x100 - this was the best all around driver I've ever hit. Maybe had something to do with the fact that I was playing 3-4 times a week at the time (and I was 15 years younger), but I've never been able to recreate that confidence in a driver. It was mindless and went forever.
TM r7 - game changing in a lot of ways, but it was just a fun club to hit when I got it dialed in, which I finally did after 3 different heads and countless shafts.
Ping Anser - best feeling head out there, hands down. It's a bomber.
TM SLDR - my current driver. Not as "hot" of a feeling as the Anser, but with my consistent low-heel miss, it performs very well for me. Really good on solid shots, just feels kind of dead, but I hit it because it performs.