Yes, I think the order is from best to worst. I'd focus on #2.
Open the link in Google Chrome, and allow it to translate. You'll be pleasantly shocked by the prices.
I wouldn't hesitate to poke out a 50 to 70 with a big bore kit. I haven't actually tried it yet. Read about my adventures with a 50 here:
http://www.chinariders.net/showthread.php?t=9421