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@JonoMarshall
Have you installed all software updates for your machine? Those machines were known to be quite loud unfortunately...
SMC is one option, as is making sure that nothing is obscuring the vents at the bottom of the machine and that it's in a fairly cool/ventilated area. Be aware that manually adjusting temperature control can cause problems, although the default ranges that OS X uses are very "safe".
Also make sure that the vent grill (bottom edge of the screen) is free from dust, etc. I would say to open it up and have a clean out of dust, but there's no point if it's been to the Apple store recently.
Finally try resetting the SMU, it's possible that the power control settings are slightly out after having the LB replaced.
Download X Resource Graph and see if any of the steps above help whilst trying to re-create your problem.
It's possible, but unlikely, that you have bad RAM installed, this stops the OS getting correct information from the hardware of your machine which signals an "emergency" ramping of the fans. (Check for this by running Apple Hardware Test from your install disk).
You may find that using a different version of OS X (Leopard/Snow Leopard) will also help as they have a better process for temperature management across all machines... a long shot though as your hardware problem may be unique.
Oh and don't buy a PC, heh.