gt40r variations?
 

hey guys, i'm in the process of finally buying one of these since i got rid of my t63. now my question is......who's got experience with these? i was thinking of going with the 1.06 a/r...... now precison turbo also sells them with an upgraded H housing and i beleive a different wheel, which brings the price up to about $1900. Or buying one "as is" from garrett is around $1450. Is it worth the extra bucks to go thru precision? how much would i really gain getting the upgrades? this isn't going to be a full out "race" car but its not a daily driver either, i'm shooting for about 475whp, maybe a lil over 500 on race gas.

Oh and this is for my FD, with a street ported motor running ceramic apex seals. any input is appreciated, thanks!