If you can swing the 8 arm, go for it. In the least, go with front lower and rear uppers. That is the best compromise, but honestly I wouldnt be afraid to just go all lowers too. I ran adj front LCA's and rear UCA's for a while. I eventually bent both of my rear lowers and that pushed me to get the other 4. 8 is def is better as it allows you to center your wheels in the wheel well and of course adjust pinion/caster to dial in your ride a little better than just 4. If your budget is tight you can get by without though.