Man you are going to find a LOT of opinions on best pipes - only slightly less than "what kind of oil is best?" answers.
There's a bit to consider too - does your new to you ride have the stock head pipe with cat or is it now cat-free?
That cat causes issues with both heat and sound and most on this site (me included) suggest going without it.
Once that cat is gone, the choice of pipes is left to settle for you.
Are you looking for sound, looks, performance?
Performance is mostly going to be up to the tune programmed into the ECM once install is complete.
Sound and looks are going to be up to individual taste.
My ADVICE, VERY HUMBLY, is that it is your money and therefore your ear/eye that ultimately need to be pleased.
Do some looking and listening at your local dealerships/bike shops/shows - there is NO substitute for your own 1st hand perceptions - find what appeals to you.
My EXPERIENCE, as with MANY others on this site, is with Fullsac products and it has been, for me, a very positive experience all the way around. From questions before during and after purchase to quality of products and ease of install and two years of use - I AM a complete Fullsac proponent.
Read down the postings here in the exhaust section and you'll see what I mean about opinions/suggestions.
Here's a good one with lots of discussion:
http://www.cvoharley.com/smf/index.php?topic=85397.0Anyway, good luck with your choice and let us know if there is anything we can do to help you.
Sparky