Tiberiu,Minifree ships T400 with T9400 and T9550 all the time, often without the customer even asking. You're also forgetting the P8700. Of course, customers can request CPU upgrades too.
T400 CPUs are the same performance-wise as T400S, and the power usage + heat generation isn't actually much higher, but the heatsinks and fans are much bigger, so T400 has better cooling than the T400S.
