I intend to land in Canada and wish to get my PR card/SIN card at the earliest. Can any one guide me on when is it better to land.... 17 Dec or 21st Dec or Feb next year or it doesn't matter?

brother it all depends on circumstances
1. when is your medicall going to expire.
2. what are the other circumstances, like job, children's school session etc.

but it would be better , if you arrive here in feb or after that cause weather is much better than dec.

Its expiring in march 04

If it is expiring in March 2004, then it is better to reach canada in March 2004 so that you are able to struggle hard during the first summers. You see winters are to too harsh at times to struggle for jobs and settlement. All the very best.

Thanks for the advise friends. I am planning to make it early march then.