I ordered mine with 2 bushings (20464FG020). They are rubber bushings so you don't need grease. That should be all you need. I can not confirm this until mine gets delivered but it is based on info here:
2010 STI sway bar question
I believe the more expensive bar ordered by others here is the 2009 18mm STI Bar (20451FG010).
The 20451FG020 is the 2010 19mm STI Bar.
Thanks all for everyone's responses. I finally caved and placed an order, after seeing basically 100% positive response from every single person that has upgraded their sway bar.
I've re-read through all of the related threads -- including this one, the RalliTek thread, and the Perrin thread -- and decided that the stock STi sway bar is good enough for me as everyone seems to be equally satisfied.
I almost went for the RalliTek because their rep posting here seemed very helpful and the group buy was a good deal, but in the end, the consensus seems to be that no one really NEEDS upgraded end links if all you're looking to do is improve your on-road everyday handling and don't expect to do any rallying or major off-road terrain.
Based on all of this information, I went with the 2010 19mm STi Spec C bars mentioned in earlier posts. I compiled about 10 different on-line websites to see who had the best prices and where they were located and to make sure they were real Subaru dealers.
I ended up going with SubaruOnlineParts.com | "Subaru Parts" & "Subaru Accessories" for your Subaru
-- these guys are a small Subaru dealer in NY state and I found many posts via Google of satisfied customers. Since I live in Philly, this will also shorten my shipping time. I'll report back turnaround time and shipping time.
Mpnret above mentioned "subarupartsonline" and that's a bad link, I think he meant SubaruOnlineParts.com | "Subaru Parts" & "Subaru Accessories" for your Subaru
because that was the price I paid-- $61.
So to summarize - for those that want to follow me and order the 19mm OEM STi bar -- this is what you need to order:
2010 STI Spec-C 19mm sway bar: 20451FG020 (I paid $61.55)
Bushings (order 2): 20464FG020 (I paid $5.51 x 2)
Shipping is estimated at $12, so my estimated total is less than $85!!!
And to think, I almost ordered a USED one off of eBay for $125!
Can't wait to install!!