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You haven't asked what you are getting from the dealer? That cost might include a SE tuner plus dyno time for all we know.
As for a tuner, you have to make a decision between tuning the bike yourself and learning how to do that, or getting someone else to do it for you. If you get it tuned then use the tuner the shop recommends. The tuner you buy for those two will probably be different, so don't buy one, then expect a tuning shop to be able to tune it for you, as there are a lot of tuners out there.
I just flashed my 2014 48 with Power Vision yesterday and the difference is night and day. Thaks to Fuel Moto adding their custom map, bike runs smoother, no surging, broader powerband, and of course a bit more power. Super easy to use and only took me 5 mins. Only down side is that its pricey, but for a HD what isnt?
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.