I have only used the B302 from Brenspeed, but it seems to work awesome on my Twinscrew Saleen blower. With the stroker and boost, 90% of your power is in at just over 2kRPM and lasts until 6.
I too was going to go with the Aluminator, but it was back ordered when I went to buy it (about 17 months ago).
Overbore won't really give you much power unless they use a custom block and really give you more cubes. I find the stroker to be great, in that it helps with torque off the line as you build boost. A twin-screw, with its near off-idle torque, plus a stroker, gives you tire shredding fun.