As folks have recommended, The ALG is a decent trigger on the cheap. It's essentially a polished up mil-spec trigger.
Truth be told, you can do that yourself. It's a simple matter to take out a trigger and polish it up. Anyone can move slowly, polishing a little at a time and end up with an ALG. Fears of screwing it up are overblown. I've worked over quite a few triggers and haven't screwed one up yet.
Having said that, there is only so much you can do with a trigger of that design. No matter how clean you make it, the sear/hammer engagement is negative, so it will always be a harder pull than what you can achieve with a nicer trigger design with a neutral sear/hammer engagement. But you can always make it much crisper with less pre-travel and grittiness like an ALG.
IMHO, that is a good route until you can afford a nicer trigger system. You come to realize after a time that there are some things you don't skimp on if you truly want a nice weapon. The trigger is one of those things.