[Ti] Ti upgrades

[John Pariseau]

> Whoa... that looks perfect me...minus the cost , for now. With a  
> dead firewire path in the sluggish-seeming 667, it sounds too good  
> to be true. I think Apple wants almost double that to do a straight  
> across mobo swap. Interesting. Extremely so.

For me - with a 550 - I'd do this if:

my LCD casing wasn't broken on the left side where I did an ad-hoc  
repair

the bus speed was increased

I had an internal combo drive

my casing didn't creak

my casing didn't have any cracks

...and...

I saw some positive benchmarks in real world tests.

Pretty nice, though.