The Torians are quite good for this kind of strategy owing to their Super Breeder ability. You can quickly grow your population, and thus your economy. This is useful as your research ability is ultimately dependent on your economy.
They're also very good at the colony rush phase of the game, so can help you gain a good cluster of colonies before you switch into development mode.
Just be sure to trade for the other races research structures, as the Torians' ones aren't that good.
As for your place on the power listings I've found that your military strength does seem to have a huge effect on this. But if your following a technology driven strategy you could always do lots of research on weapons, defenses and miniturization. With these three lines of research well developed you can build up a small but powerful fleet without too much trouble. That should boost up your military strength, and thus your ranking on the most powerful list.