Security Clearance is dependant on the company and contract. Best bet is to apply and see what happens.
Some companies will hire folks with no clearance and can deploy them to certain spots with interim secret clearances. Some companies won't take 30 minutes to write a memo requesting DHS transfer clearance details to DoD.
Pay is always dependant upon company and work location, but PIC supposedly is up to around $900 a day depending on the company; if the contract was underbid by $20 million though, I'm not sure how pay and benefits at certain companies will keep pace.
Some companies will deploy you from El Paso in coach on Omni, some will now buy you a Business Class seat.