Thanks, that's something I hadn't realised.  After googling, I've found this 
article comparing the i-RAM with a couple of SSD's, and the difference is quite 
something:
http://www.xbitlabs.com/articles/storage/display/ssd-iram_5.html

However, the SATA interface's limitations soon seem to even things out a bit:
http://www.xbitlabs.com/articles/storage/display/ssd-iram_7.html

So far STEC seem my best option (especially if EMC see fit to use them).  I'm 
trying to find prices now, but it seems their SSD's have quite a range of 
performance available, with the Zeus IOPS range being the king of the heap at 
45,000 IOPS:
http://www.stec-inc.com/product/zeusiops.php

The Vmetro card would probably put it to shame in terms of throughput, but 
while I'm going to try I doubt I'll be able to get my hands on one, and SATA 
has its benefits in being a tried & tested technology.

Thanks for all the advice everyone.  I'll keep this thread updated with prices 
& details once the manufacturers start getting back to me in case anybody else 
is interested in this tech in the future.
 
 
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