1800c- Yokohama S Drive or Toyo - Questions-Newbie

I am a newbie and have a few questions before selecting a tire.
After reading MANY posts and based upon the list of tires used (Yoko Avid and AVS) I am looking at the Yoko S Drive. Has anyone ran this tire and what is your impression?
http://www.yokohamatire.com/tires/s.drive.aspx

The other tire I am leaning towards is the Toyo. Either the T1 or Proxes 4
http://www.toyo.com/docs/tires/tires.asp?category=sport

Neither brand seems to make a 205 60 16, so my choices are either a 50 or 55.
Which will effect the inaccuracy of the speedometer more?
Which am I more likely to NOT have to do any mods?

Riding 2 up, I am 6'2" around 230 and my is around 145. Stock shocks set to 5.
Metzler 880 on the front.

Thanks.

I ride a 1300 so all I know is what I read here. Seems like a lot of people like the T1R- 55 series...

Jerry

I'm a Toyo fan myself, but you might want to look for something closer to the 60/65 profile to keep the speedo close...