I would strongly suggest heading over to the AVID forum before even thinking about Pro Tools...
Page after page of nothing but issues and even the AVID support staff there spells it out plainly that "Pro Tools is in need of a TOTAL REWRITE" because its limited to 3GB (no 64 bit), cant not handle more than 2 or 3 VI's at once on ANY system (poor RTAS performance and AVID tells you to go buy other software like VE Pro for $300 or Reaper to host VI's via ReWire 😮), and constant/random crashes... and it IS still crippled/limited on track count and ADC (limit is 4000 samples)
$599 for that? (yes...$600!!!)
You would be MUCH better off $$$ wise getting the upgrade to Logic 9. I was a long time Pro Tools user and RAN to Logic and have never looked back... trust me it IS a night and day difference
Logic 9 runs fine on Lion... Pro Tools 9 is BETA on Lion and is slow and glitches badly
All this BS about Pro Tools being the industry standard is total crap... Pro Tools HD is what they are refering to... at a STARTING price of about $10,000 to $30,000
Yeah... switch if you like