I had a KG7 and now I have a KR7A-Raid. That would normally be enough said but I'm a big moulth so.... The 133 would be cool but I don't know of any CDRws or DVD players that are 133 capable. I suppose one use could be to hook up additional hard drives but 1 on each raid controller is good enough for most(raid 0 1 or 0+1 capable). This would save ya at least 10 bucks(perhaps upgrade the chipset cooler or get a better brand of ram). The AMD 761 chipset would not overlock over 145 for me with samsung ram, xp 1800, antec 403 power supply, and very cool temps(37c load).
That's my two cents, and you wont regret spendng the extra few bucks on the KR7A series