I'd advise against RAID0 as well. But if you must......
RAID0 from my experience is too much of a pain to use as your root. Lilo does not support it, and it takes a bit of monkeying to get it to work, and if you do something like kill your lilo its gonna be hell making it right again. So this is what I suggest......
Make a boot partition on the first drive. Myself I made a 35meg boot partition on HDA. Then make 2 sets of raid partitions. One for your base filesystem, and another that you will use to put the swap file on. So what you end up with is 1 boot partition, and 2 raid0 sets. (some FAQ's suggest letting linux manage the swapfile across the 2 drives, I personally disagree as I found such a setup to be horridly slow. Putting the swap on the raid seems to be much more efficient at least when using IDE drives).
So basically with this setup you eliminate the problems that come with trying and having a RAID0 on your root partition, and you end up with a system that boots "simply". And you will still have your RAID0 performance working for you just the same.
Ive done RAID0 both ways, as root, and the way I just suggested and the later I was far more happier with.
RAID1 is not much slower than RAID0, could even be considered negligable in terms of read speeds. RAID0 really only has a leg up on RAID1 when it comes to write speeds, but if your doing IDE RAID write speeds wasn't a big thing for you anyway. Also RAID1 is very easy to setup as your boot partition as lilo supports this
I'd stress that you really should think RAID1... or your liable to spend alot of time trying to make RAID0 work just to have it crash and all be gone.