this guy might be trustworthy; according to this benchmark comparison the difference is less that 2 tenths of a second between the two procs:http://www.anandtech.com/bench/CPU/33
he could have sold you a more expensive chip w/o saying anything.
btw, +1 on the storm trooper case
just don't let your box get jarred while in transport. i always thought about making a case with wheels myself.
how about a flight case to put it in like for audio equipment . .?