Hell yeah get them to match the price! Or at least give you some kinda combo discount.
Unless you're getting the Shuriken for ~$20 or less, I'd seriously consider changing your mind, especially if you intend to overclock. (Which is usually the whole reason to get an aftermarket cooler...) There are better coolers in the Shuriken Rev.B's typical $30 price range like:
Cooler Master Hyper 212 Plus
Xigmatek HDT-S1283/S1284/S1284EE
Scythe Zipang 2 (SCZP-2000)
And many more around within $10.
The Zalman CNPS10X Performa is a very solid ~$40 contender.
Another ~$40 contender is the Akasa AK-967. It's hard to find in the US, but it's reviews all affirm it's a damn fine cooler that rivals all of the above, yet manages to do so while remaining as quiet as the Shuriken. The others will all be noticeably louder. I think Sidewindercomputers.com might have it. They're one of the very few Akasa dealers in the US. I got 2 AK-920 EVO CPU coolers and a Vortexx Neo GPU cooler there.
As for the motherboard choice, I like it! I have a very similar AM2+ Gigabyte board I purchased last June and I love it.
Something to consider... AMD's 6-core CPU's are scheduled to debut in roughly 3 weeks. So far, most speculate they're going to be damn good CPUs falling in the $200-$300 range initially. No one knows if it will affect the AMD 955/965 prices any, but if there's a $200 6-core that runs around 3.0-3.4 GHz, it might just be worth the extra $20-$40 over the 955/965 CPUs. I'm anxious for their debut because I may replace my current Phenom II X3 720 BE with one.