I have narrowed it down to these 2.
Matched 7 cell 4600's from promatch. (109.96 for 2 shipped)
Unmatched 7 cell 5000'sfrom CBP.(125.86 for 2 shipped)
Decided against SPC since a matched pack is 72.70 or 87.90 per pack. I do not race or plan on racing my stock Slash.