where to get bearings for my NUE?

[rootar]

since my motor will never exceed 33-34k rpm is the 60k rpm bearing nessecary? all of the cheaper bearings are abec1 which aint very great. but if i hsve to im looking at these because their sealed http://www.bocabearings.com/main1.as...6&n=SMF695-2RS , im also looking at these http://www.bocabearings.com/main1.as...228&n=MF695-UU because after research the ultra seal bearings are supposed to work very well.

what would you chose, its extremely sandy and ultra fine dust....