Memory question crucial/owc/Apple

Ok, first off let me clear the air and say that I've been a long time crucial user in all of my computers and have not been disapointed but now with my impending promac arrival, well not until septemeber. I'm not so sure about crucial
I read someone (I failed to recall where now) that apple recommends its memory modules for the MacPro because of the heat sinks it uses is designed specficially with the cooling archtecture of the MP. I understand that OWC (and Crucial) has heat sinks on theirs but they may not be the same.
Second, while crucial appears not have any memory for the MP yet they have not that much cheaper in prices then apple lately. A dark horse in this is OWC, while cheaper I worry about the heat sinks and of course quality.
I'm a big believer in you get what you pay for.
I'm really only interested in getting an additional gig to bring the MP up to 2 gig. I'm a medium Aperture and low to medium photoshop user. I found 2 gig to be the sweet spot on my PPC mac's but I understand that may not be the case for intel macs. Budget is the over-riding factor for only getting a single gig.
Apple prices:
1 gig kit 300,
2 gig kit 700 (yikes)
OWC:
1 gig of ram 419 (buying the 2gig kit and trading in the install 1gig for a credit of 140) I don't seem to see a 1 gig kit at owc.
2 gig 559.
crucial
1 gig ????
2 gig???
they appear not have memory for the MP yet.
Any advice or suggestions would be welcome. Budget and peace of mind is of high improtance. I generally have to pay a little more (key word little) for peace of mind and get crucial but they seem to be getting expensive. When I purhcased my mini, their memory was the same price as apple's so I had apple install the memory (it didn't help that the mini's memory isn't considered user resplaceable) as a CTO option.
Mike
Mini MacBook Mac SE
Mini MacBook Mac SE

AccelerateYourMac has been on top of this story (OWC sponsered site) with notes from Crucial that they needed to do more work and they do have a close relationship with Apple (obviously).
Micron has had DDR2 'bleeding edge' memory in the 800 and 1000MHz range for the serious gamer / enthusiast / OC'er crowd.
Someone did get some early Crucial RAM before they stopped shipping, and it worked, but noted that the top riser seems to be get more airflow and run cooler.
Do you remember when the G5 first came out and what the prices looked like this time 2003? Initial prices of $400 per GB as I recall before dropping to $120 and below. There were also some problems the following summer when the next gen G5s came out and there were some compatibility issues mixing from different vendors or sources, or even different batch variations from the same source. Or that some RAM that seemed to work fine previously "broke" or caused trouble ("marginal RAM"? though more a catch-all phrase).
Also, OWC was carrying more expensive Samsung for the last year and is now carrying some Micron labeled chips as well as "OWC label" (house brand?).
I'm waiting for Oct/Nov for things to settle out and for any 'rev 2' changes, as well as avoiding early production problems.

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http://www.ramdirect.com/vcom/index.php?cPath=1723
(I have no relationship with the company, other as a satisfied customer.)
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Hello Jan
Welcome to Apple Discussions
The iMac (Late 2009): Installing or replacing memory article and your User's Guide are pretty clear, they both say that +"You can use 2 GB or 4 GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot."+ and not 1GB modules. > http://support.apple.com/kb/HT3918
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