well the reason for the upgrade is Raidcore BC4852 in OZ is virtually discontinued only a handful of places stock them as order in items at AUD$550+ each
my current BC4852 is out of warranty 1.5yrs old on 1yr warranty in OZ, so if it was to fail, even a raid 5 array would be useless as i wouldn't be able to get my data back unless i sourced another BC4852.
whereas, Areca, Highpoint controllers have alot of availability as PCI-E would be a speed upgrade for me as my BC4852 is only on 32bit/33mhz PCI slot right now.
Promise EX8350 i read ran very hot and had poor raid 5 write performance ?? it costs AUD$780 here in Australia with 1yr warranty - that's only AUD$173 less than Areca 1220 PCI-E controller!
The 1yr warranty really throws a spanner in the works, as i wouldn't mind forking out AUD$953 for Areca if it had 3yr warranty, but 1yr is an expensive risk!
It does sound like Highpoint 2320 is the choice right now though unless folks here have other opinions or comments ?