anzee bhai I think everything is perfect in your case ruksati is not necessary before PPR. Agar apko abhi tak nahin objection mila then that simply means that everything is going to be smooth in your case and Inshallah by march or april you will have your ppr according to the time line in recent cases.
I dont want my wife to suffer in depression after ruksati therefore I choose to have nikah only. But at the end its all about what suites you better.
I had only nikkah too. i applied in jan 2011 and sent some voluntary documents in oct 2011. i have seen ppl getting objection so i am going in feb 2012 to complete everything and send pict to CHC. if, i am waiting for response it could be no objection or objection marriage is not genuine and it takes more 4 to 6 months, better to go and send all proof and i hope my wife will be here in july 2012 or aug 2012.