so if i go 1 up on the rear (46T) or 2 up (47T)...how much longer does my chain need to be??

Because the link Ali has given to the EK chain allows you to specify number of links. (could buy a longer chain just to be sure then cut some off??)

As i said before the standard DID chain on Wemoto says its 100 links??? (meant to be 110)

any one used SunStar sprockets?

Cheers