The reason for the smaller motors on some of the Taigs is that they actually perform better when using the budget drivers (Xylotex, etc.) Too big of a motor with the budget drivers and either a) you drive them at less than rated current and get less than rated power anyway, or b) they have high strength and low current ratings, so the inductance is high enough the coils never charge all the way before firing anyway, and again less than rated power at any real speed. You also get a lot of other less tangible gremlins using either of these ways that really kill performance.
Both of these options give less optimal performance than just using smaller, lower inductance motors with the budget driver in the first place.
Even one of the major dealers, who in order to just get machines to move has to play the "number game" and ship Taigs with 495/oz motors despite his advice, uses 200/oz motors on his own. So do I (about 230/oz for mine). Works great with a Xylotex actually. It's just that no one will believe they work better, they want the bigger hammer and end up getting a machine that is weak, and therefore think they need even bigger motors without ever thinking about how they match the driver. It is a vicious cycle.
That said, the bigger motors can obviously be of great use on a Taig, but only when coupled with the proper higher voltage and current drivers like the Gecko, the MCP, or the bigger Kelings.
Basically, just match the motors to the driver and you are fine either way. It ain't rocket surgery, just do the math, but there is always someone that finds it easier to try and flame those who give that advice off of a forum than to just pick up a calculator, so there is a lot of confusion out there still.