Just don't put your SSA in an MPX. Surefire way to kill it.

I am very happy with my Velocity trigger.  Drop in, (small pins .154"), 3 pound pull weight, single stage and curved trigger.   I was also considering the CMC trigger, also single stage, drop in, 3.5#, curved trigger.  I think retail price for the Velocity is around $135 almost anywhere.  So, it is well within your budget.   My stock trigger (Colt) was single stage, and a tad over 6#s of pull.  The Velocity improved my marksmanship , especially shooting off-hand.  I think any trigger mentioned here will do the same for you.  The lighter trigger pull of any of these triggers (mentioned) help a lot with tightening up shot groups, IMO.  The Velocity seems solidly made and of good quality as did the CMC and two others I checked into (the Elf for one).  I basically went with price as the Velocity had the features I wanted.  I'd do it again.   Good luck.

Lots of good sales now.  I just got an email from Brownell's with sale on Geissele stuff ends midnight today.

http://lp.brownells.com/index.php/email/emailWebview?mkt_tok=eyJpIjoiTmpFME5qYzVZemhtTURreiIsInQiOiIwekIyVVhyTUpQYU9ZV3MyWVA1SGJIT2IzUHFVOU9CY0Uya3o1c0kxNFlBVGpOVkh6VDdsbE5HdWZEMCtVUE5ITHVXUm52YXMyd01ubWNSTkZPUmdvSFJFZHZLRDA5ZG9qMU8yMnF0c1BJSlp5V2dBQjBPMVNnSGl1TmZrTVRwbSJ9

Maybe showing my age, but the KAC is still my favorite, LMT 2-stage is pretty good but $204, good grief, I think WES (MSTN) sold me mine for $60.

Geissele 2-stage trigger can be found for under $200. I've shot quite a few and this and the 3-gun, which is more expensive are amazing. You can use the 2nd stage for a clean break for accuracy or pull through it for rapid fire. It's 4.5lbs. With it split times can be under .2 of a second.

Well that's good to know, that's what I ordered.