Wow, I missed a lot of discussion over the past few weeks! It's good to see.
First off, in response to Simon's question about different levels of GOD times: personally, I would choose "G" (standards slightly harder than "A"). But I like "A" as well.
Personally, if I ever achieve a GOD standard then I wouldn't feel as if the standards are hard enough. That's why I really like the page at Masakazu and Monchuck's website, which shows the "fastest" driving lines for each course (using NBT) and giving a proposed fastest 5lap time and Flap time (which I've always considered to be their idea of the course's limits, but perhaps I'm just jumping to conclusions since I can't read Japanese

). The times they post at that page are insanely fast (with the exception of a couple tracks).
I've had so much fun playing smk on the Player's Site and the Non-NBT site over the last while and after seeing everyone's constant improvements it's brought me into the state of mind where I believe all WRs could be faster (similarly to what Simon was saying). I'm definitely not trying to take away the feeling of accomplishment or the time and effort it took for players to achieve their WRs, but I just feel "there is always room for improvement". And I think faster standards could motivate players to bring their PRs and WRs even lower than was ever thought possible.
So, I tend to lean towards the idea of GOD standards being virtually impossible to reach, since it is the highest standard after all.
I like the idea of the rest of the standards being changed as well (Legend, King, etc..) to balance out the new GOD standards. I agree with Simon that the standards wouldn't be balanced if only the GOD standards were changed. I feel that a Legend time should still take me a lot of work and effort to achieve. And Joe, don't worry about BC1

It took me nearly 18 months to get GOD on BC1 flap at the Player's Site. Stick with it!
And as for those GOD standards you posted, Simon: I like that they're fast

As for KB1: getting a 47"xx is definitely something I'm aiming for before my karting career ends, so at first I felt that the GOD time you posted wasn't as fast as it could have been. But, over the past few weeks I've realized just how fast I would have to drive to achieve a 47"xx and it just doesn't seem at all realistic for me anymore (especially considering my best 1st laps on that course aren't very strong at all). So I would agree with your 5lap GOD for KB1 (though, maybe even 47"74?). As for the flap, well I'm quite weak at flaps so I wouldn't really know. Keep in mind that my 9"39 wasn't the last lap in a 5-lap attempt, and I feel the 5th lap strategy can gain about "05-"10 (just a guess, and maybe I'm being a bit generous with "10), so I personally wouldn't mind seeing the flap a bit quicker

Nice job on those proposed GOD times.
Lastly, I hope we can please everybody (as hard as that is). I would definitely be interested in new standards at both the Players' Site and the Non-NBT site, but if it will only discourage newer players then I wouldn't mind keeping the old standards. Hope things work out for everyone.