IO job isnt an ideal one for the people who have bossy attitude...as far as perks and benefits are concerned, those are almost none. being in Islamabad you will have to arrange your own accommodation coz even officers from DMG and PSP find it really hard to manage a Govt accommodation until they reach upto the BPS-19.
Otherwise everything is possible with reference in Pakistan I know few of the PROs and IOs who are enjoying Govt residence in Federal Lodges and having Govt Vehicle (Cultus) as well. But normally it is not available. One has arrange his own car and accommodation. pay is around PKR 22,980 to start off

Best of luck