On the other hand, Alpha grade Wired Reflexes Rating 1 (10R) and Used grade Reaction Enhancers 3 (11R) is a decent deal for a starting character as well; +4 REA and +1d6 Initiative Dice for 76050 nuyen and 2.725 Essence, although you do leave yourself vulnerable to hacking this way.
By comparison, Synaptic Booster Rating 1 is 0.5 Essence and 95000; it can't be detected by scanners or hacked, but you also lose out on 3 REA.
For a Rigger, I'd stick with the Reaction Enhancers on their own, purely for the added driver skills.