I believe that a robot design must be picked for your teams capabilities, style, of driving, and overall mentality. If you team has the money and the resourses and the time then you should possibly build an extremely good ringer scorer. But if your on a team with a limited budget and and minimal resources then mabey a slow powerful defensive robot is more you style.
Regardless of whatever you situation is I think that this will be a great game to promote innovation and there are gong to be many different robot designs this year. A well ballanced alliance may be one of the most important things this year, a mix of good ringer scorers and and lifter bots may be a force to be reconed with.
On different note I think fast manuverable drivetrains will be needed if you are going for anykind of good offense this year. And the multiclass system is a good addition and I think that many of the offensive robots this year will come from the 6 foot class they are already light which gives them a speed advantage, but a good defensive bot should be able to counter that.
2007 Will be the year of the Mecanum Drives
Now to convice my team to use one