You don't need to spend all the money for a fulcrum trigger although it is the easiest way to get a fairly good trigger. 200-250 bucks+shipping is a bit stiff for me and I'd rather just buy another gun at that point.
For me, I'd spend 20 bucks and you can have a glock with a true 3-3.5lb trigger pull, very little pre-travel and no over travel (spring kit+connector+melt the stock firing pin safety). You can take out all the pre-travel out of the trigger but your gonna end up disabling the drop safety, if you do this though the trigger weight will drop by about half a lb. Spend about 10 bucks to adjust where the trigger pivot point is and you'll end up with a ~2lb trigger pull on stock internals, sub 2lbs when you do the mods mentioned. You won't be able to use this mod on official matches like idpa but its a fairly easy and nice mod to have. It's what the fulcrum does some what. If you do go with this route, you can use a heavier connector to get a more crisp trigger break although its never gonna be a custom 1911. question is how light of a trigger, how much money do you want to spend, and what type of trigger break can you live with?
Reset can be modified by play with the nose of the trigger bar. get it right though or you might make wear an issue.
Remember to polish everything up with a dremel and that will smooth out the trigger for you. Don't use q-tips or you'll end up with shiny rough edges on all your mating surfaces which won't help a damn thing. Also remember no matter how shiny the aftermarket connectors are, they can always be improved with some polishing. For me, I don't even bother with the dremel to honest, I go straight to my bigger wheels to get a true mirror polish on all the mating surfaces.
Best thing about all these mods are that they can all be taken off and the gun be put back to stock in just a few mins and their cheap as hell! I bought my glock just to see how far I could mod it and found out a glock can have a fairly decent trigger on the cheap.
These are the basic mods everyone can do, there are more advanced mods like cutting the firing pin nose and bending the trigger spring bar, shaving the firing pin, or tig welding more metal on to various parts of the trigger bar and firing pin to get even shorter resets or lighter pulls and more crisp breaks but you probably don't need to go that far in modding your glock. Remember to use a real trigger scale and not a stupid fishing scale to check your mods.
Have fun.