QUOTE(yisien @ Apr 30 2013, 12:27 PM)
"gapps-jb-20130301-signed" this one?
Yep.
QUOTE(yisien @ Apr 30 2013, 12:27 PM)
May I ask does this gapps package have any difference with other rom dev own gapps package?
This is the standard gapps package that one flashes for most ROMs, the only exception is for ParanoidAndroid ROMs you'll need to flash that particular ROM's gapps package instead.
QUOTE(yisien @ Apr 30 2013, 12:27 PM)
And why on the xda forum cm10.1 nightly thread they stated that it is optional to flash the gapps packages?
Technically its optional, but you won't want a Google phone without a Play Store no?
QUOTE(yisien @ Apr 30 2013, 12:27 PM)
Sorry for too many question

It's alright, we're all mates here