the only dual core processors had been the 2.0 ghz and 2.3 ghz both air cooled
then the quad 2.5 ghz (2x dual core 2.5 ghz cpu ) liquid cooled the fastest ever produced PowerMac
the 2.7ghz is a dual processor ( 2x 2.7ghz cpu's ) liquid cooled
the lcs is nothing to worry if you are confident in refurbishing the lcs system which is actually not as complicated as it sounds , only problem really is when its leaking its first victim usually is the powersupply and the second victim the logicboard , because this liquid is highly corrosive and destroys everything in its path
but in therms of reliability there is always the dual 2.3 ghz air cooled too to consider , the most reliable PowerMac G5 and not much slower then the 2.3 dual core about 50 geekbench points difference and only about 250 points difference to the 2.7ghz , so not a difference you would notice in day to day use, but the 2.5 quad is giving them a run for their money with a geekbench score of over 3300 so a good 1100 points above the 2.7 ghz model
the PowerMac's are going down in price at the moment rapidly , like anything pre intel apart from the mini's which are in high demand and quiet stable in price ..at least here in the UK , it might be different down under, but it is really a question of condition and spec sheet and included software ,which can bring the price up to nearly early base MacPro levels
