if you don't know what you want yet but want close inexpensive generally similar to the original emulations, pick up
a focusrite liquid mix (the 16 is cheaper, I own a 32, just got it).
I own a real 1176 (well, I built it myself), and have used many older studio standards. in my quick playing with the liquid mix I can say that it does capture the overall tone of each of the compressors that I knew, I recognized them without looking them up most of the time (liquid mix uses fake made-up names for famous branded models, but there's a lookup pdf on their site and an even better one on gearslutz).
so although I've only just started playing with my liquid mix, I would say from my experience with the real things that you'd be better off spending $250 or $400 on a LM16 (or LM32 used) to learn the differences in these models and see what you like best.
Because, in my opinion, if you own an 1176 for that price you'll want to use it as much as possible, but there are times when it's far from appropriate. if you own an 1176 you really need something mellower and slower like a nice opto (la-2a or my fav la3), or even a poor man's opto (
pro vla II, same type of speed/effect, much less character than la-2a but still very nice musical optocomp). and then you'll want a nice punchy comp, something more crunchy, something really transparent.... well you'll get all of those in a liquid mix.
same with a uad by the way, but uad wtih those plugs can cost much more total, so I'm trying to save you money.
UAD is great but gets pricey. liquid mix comes with (including free downloads) several dozen famous compressors and anohter few dozen famous eqs.
but if you want a tracking comp you need to start looking into hardware... there's a reason why I still own hardware. The sound, the versatility, and tracking through a comp results in different sound/usefulness than mixing through a comp, although it takes experience and guts too LoL