Look at the chart here:
http://home.comcast.net/~theledguy/bin_codes/index.htm
Like I said above, the X0 and the W0 ranges are very small compared to the YA, Y0, X1 and V1 so they tend to be more consistant. That is to say, if you had 10 lights with 10 X0 stars installed, there would likely be some variation between them, but the difference doesn't tend to be huge. On the other hand, with X1s and V1s in particular, they can range from just slightly off white to a VERY pronounced tint that I personally wouldn't be happy with and I'm not really a tint junkie... unless it's horrible, I'm usually pretty happy.
Of course, we will all have our personal preferences and that will often be limited to our experience with the various bins and how many emitters from each bin we've actually compared first hand. Some folks tend to like the V1 for outdoor use as it tends to give arguably better color rendition between greens and browns. The YA and Y0s tend to be towards the more blue and violet end of the 'white Luxeon' range so while they tend to have that cool HID-ish look to them, they aren't the best for outdoor use in my opinion.
But what it REALLY comes down to is, if this is the only higher end light you have, you'll more than likely be satisfied with either the X0 or the Y0. The X0s tend to be very close to white with a
very slightly blue tint while the Y0s tend to have a pronounced white tint. This is not to say that if you shine a Y0 against a white wall, you'll think it's blue... these are realatively minor difference... but again... the Y0 range is large. I mean, it borders on the X0 range. You could have an X0 and a Y0 that are essentially the same tint or you could have a VERY white X0 and a VERY blue Y0 and you could easily tell the difference.
This is why it's called the Luxeon lottery!