I changed mine a couple months ago for the same reason. The stock bulbs are not only cool but have low output and poor color rendition.
I had a thread on this here:
In short I got mine from alldaylighting.com. They're supposed to be Philips Ultralume 30 tubes but when they arrived they were in European packaging. I believe the tubes are the same and they certainly perform well, though there has been some flickering which I attribute to poor ballast quality. These tubes are supposed to have a CRI of 85.
You will need two F15T8 bulbs for the lavatory in addition to the 12 F8T5 bulbs everywhere else.
The Ultralume 30s blend in well with the dinette and the halogen reading lights. On full brightness, the halogen lights are a little cooler than the fluorescents, but not much.