After some deliberation I also went with the greddy. Price was definitely but not the only factor. There is still some dicking around with the greddy but at least they try and make it easier by providing the neccessary vacuum and water ports plus the necessary bolts, hoses, clamps etc to assist in the task.
I had difficulty locating a q45 so I went with a new aftermarket 90 mil throttle body, we had no probs mating it to the plenum and the standard throttle sensor just hooks straight up to it. You will need to have a throttle cable made up but its no biggie.
My bud tried the Greddy copy but ended up giving it away simply because there is just too much work to do locating and fitting the above mentioned ports etc plus it didnt sit too flush with the head anyway so required facing before he could even start.
GL with whatever you decide but for me I am way happy with the Greddy choice.