Tweakit in Mona Vale sell RB25 water pumps for $80. Not genuine Nissan, but it's the same brand pump as my mate runs in his drift 180SX and it hasn't skipped a beat. Click here for Tweakit's website thingy.
If I where you I'd change the timing belt regardless considering you have to remove it to get at the pump anyway, but that's just me
I thought you where removing everything you don't need
Like Chris said, you will need to get it engineered and registered as a two seater. While your at it you should get a pair of fixed back bucket seats combined with harnesses
Out of curiosity, why do you want to remove them?
I think you'll do faster, last time I went to Wakefield I went with a guy who had a NA6 with similar mods to yours (Tiens, R888s, seat... but no harness, no rollcage, no Mania CAI) and he was getting 1'15". NA8 has better engine and brakes
Buy a old diesel cab chassis LandCruiser and put a crate on the back of it. You know, something in between waist and shoulder hight and good for leaning on and holding onto
The R33 is going to depreciate weather you sell it now or later so it doesn't really matter. I would keep it if it was exactly the way I wanted it (for me this would mean as stock as possible and immaculate condition, you may see things differently). If it wasn't the way I wanted it I would sell up and buy either the aforementioned LandCruiser or a Subaru of some description.
Then again, it would be good to see some fellow Riceliners when I go on epic treks to the bush
I use Royal Purple for my motor oil, dif oil and gearbox oil, no complaints
Seems to handle track work better than the Castrol Edge I was using before hand, doesn't get black as quickly
If your just after a minor service (ie, fluids and filters) you're probably better off doing it yourself, provided you know a little about what your doing