Triggers:
I have a couple of Geissele SSAs. They are "nice" triggers, but I have come to prefer single stage triggers (Geissele does make some single stage triggers, too). One of my gripes with the SSA is that after the reset, there is a slight take up, which messes with my cadence if I'm trying to shoot faster (controlled pairs, failure drills, etc). I like a bit stronger of a reset than what the SSA offers. But a 4-5 lb single stage would be good for me.
If you want to try different stuff for yourself, go with LaRue (or similar) for around $70 to see if you like a lighter two-stage trigger. If you still feel the need to get a Geissele after that, go for it. But there are great triggers out there other than Geissele.
For example, I like the stock BCM trigger enough for a general purpose self defense tool that I won't ever change it (it's just a polished mil-spec trigger).
Charging Handles:
This is one of those things that I can't really justify from a practical stand point, and yet I find myself "upgrading" the charging handles on all my rifles. Of the ones I've tried, I like Geissele the best. But, IMO, no charging handle is worth $100. I'd wait for one of Geissele's sales (I got all mine on their Black Firday deals) before getting a charging handle (if the one you have now isn't broken). FWIW, the Geissele ACH is my "go to" for what I consider to be luxury upgrade. Others will say that a charging handle is a "must have" upgrade.