PR2 is good for a website 3-4 months old. Try to keep posting and build 20-30 links per day for better ranking in SERPs and higher PR.
Use some social bookmarking get some quality links and traffic too. It will increase rank easily to my friend.
PR really doesn't count towards anything. It really doesn't mean that you are going to get more traffic with a high PR site. Just do a simple search on google for PR what they say about it. To give you an example. Do a search on Google for golf clubs - http://www.google.com/#hl=en&cp=7&g....,cf.osb&fp=20d70a48d6bea48f&biw=1366&bih=667 The first site has a ranking of 2/10 - http://www.americangolf.co.uk/Golf-Clubs/c4772.aspx The second site has a ranking of 4/10 - http://www.golfsmith.com/category/golf-clubs Even though the firs site has a ranking lower than the second one, I can gaurantee you that the first result gets more traffic. So here you have proven fact that PR doesn't matter for traffic or ranking on the SERP's.
The more the PR the better it is. PR 2 is good at start, keep building the backlinks periodically to gain high PR or your will loose this value too.
For sure PR 2 is good for an initial website, keep preforming SEO activities as such it would reach to PR 5 or 6 in no time what so ever.....
i agree with Grobbulus...more focus on serp not pagerank because...excellent serp will growing your site...
Is you sastified with your current organic traffic from that keywords? i don't think people will satisfy with your SERP in the second page. It would be better for page one . and on top 3. I promise you that you will get atleast double traffic from the keywords.
continue doing the same thing that you are doing for the rank 1. but in a more precise way and also take care about quality rather than quantity.