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1. What Firmware comes on the white PSP's
Either 1.52 or 2.0 (i have seen both of those on White PSPs)
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2. How easy is it to choose what firmware I have, I see theres now a downgrader from v2.0 to 1.5 but if I run the updater on it does it update to the latest version (Above 2.0 for example.) does it therefore not allow me to use the downgrader..
Once you go above 2.0, you can NOT downgrade.
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3. How long does the battery life roughly playing an emulator from a stick, assume its longer then running a disc..?
Depends what your emulating, if your running ROMS for older consoles , you get a lot more life, if your running PSP ISO's (your backups i should hope), you also get a lot longer, about 150-200% battery life. (it depends on what speed the CPU is running)
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Does the wireless have good range..?
Depends on battery life, i normally get very good range.
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Does the wireless eat the battery life immensly
Its not too bad, quite good actualy.
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Any good Final Fantasy/Suikoden/Shinning Force type games out on the PSP yet..?
Pass, not my type of game, check game review sites.
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Are the racing games any good on such a small screen..?
Yes, some of them (burnout, ridge racer) are very good.
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Is the hardware mod thing to allow the PSP to display on a large screen and have a PS2 pad plugged in the back removable and allow me to use the white cover still as the covers that come with the mod look naff and I cant find instrauctions..?
Best too look on the manufacturers site.
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Do emulators/the downgrader/homebrew have to be run from the root of the memory card..?
No,
Emulators and homebrew run from (root/PSP/GAME)
Downgrader runs from (root/PSP/UPDATE and root/PSP/PHOTO and root/)