The new Mac Pro's and the new iMacs

Greetings,
I'm in the market to finally replace my G5 Mac tower for a more contemporary model. I see that Apple has finally refreshed the Mac Pro line. I was hoping for some CPU clarifications.
The iMacs all say they use i5's and i7 processors. But according to wikipedia, those are Nehalem processors. While looking over the Mac Pro's they claim they use either Nehalem or Westmere processors. From a general prospective, the Core i7 is the same as the Nehalem?
So if they use the same processor, wouldn't it be more cost effective to get a high end iMac (Core i7) over a low end Mac Pro (Nehalem?
Then there's the Westmere's. They also use the same name of core i5. So does that mean the iMacs use Westmere's or Nehalem's?
Why oh why does this have to be so complicated?!
Thanks!

Intel chart (link from Barefeats) shows processor family. i7 "Bloomfield" is so... 2009 which is desktop subset name of Nehalem.
Intel Core i7 870
http://ark.intel.com/Product.aspx?id=41315&processor=i7-870&spec-codes=SLBJG
Amazon i7 870
http://www.amazon.com/Intel-2-93GHz-Quad-Core-LGA1156-Processor/dp/B002KQ5KEI/
http://ark.intel.com/Compare.aspx?ids=41313,39721,47917,47925,47922,47920,
http://news.yahoo.com/s/macworld/20100727/tc_macworld/appleunveilsnewimacincludi ngquadcoremodel
http://en.wikipedia.org/wiki/IMac_(Intel-based)
IS THE TOP iMAC THE BEST BUY? The 'mid 2010' iMac Core i7, is as much as 45% faster than the Core i5 for 10% more cost. The Core i7 is as much as 104% faster (twice as fast) as the Core i3 for 29% more cost.
The new Quad i7 boosts up to 3.60Ghz when only one core is used.
http://www.anandtech.com/show/2832/5
You can get Core i7 27" ATI Radeon HD 5750 1GB GDDR5 SDRAM $2200 add your own RAM.
Look at what people are saying about iMac 2010
http://forums.macrumors.com/forumdisplay.php?f=91
+I edit 5D Mark II RAW files on a 3.06Ghz Core2Duo iMac (early 2010 model) which has 4GB of RAM. Editing and such works very well with both Lightroom and Photoshop CS5.+
+Give my expreience I would recommend the lower spec 27" model with has a i5 dual core processor as opposed to quadcore i5 (or i7) processor in the higher priced 27" iMac.+
+With the money saved I'd buy two additional 4GB Ram Modules (~$250-300 total) which should give you 12GB total ... plenty of headroom to process even large collections of files.+
+I am buying an i7 iMac with 8GB of Ram extra right now. But i need the i7 manily for pralell programming, video editing and 3d rendering ... but not so much for editing photos+
+http://forums.macrumors.com/showpost.php?p=10783147&postcount=15+

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