Since I'm pretty sure you aren't going to upgrade much more than the GPU with $100 (for a good CPU like a i5 4570K, it's already 200ish last time I checked; getting more, faster ram (faster will be more noticeable than just more) 'should' be in range but the GPU should really be priority anyways), You should try for at least a GT 610+ for minimum shaders for most builds in the modest 5-15k range and at least a GTX 750 for satisfactory speed at max shaders for most regular things. (probably exaggerating how much you need a good GPU, but you really do need a mid to high end one to really enjoy maximum shaders in almost everything. basically, if you can get a GTX 760+, by all means get one if your system can support it and won't be bottle necked by other stuff which it likely could be.).
A geforce 210 can run maximum shaders...at a unusable 2-3 FPS for anything worthwhile, so it doesn't really matter if the GPU can run it if it can barely do so.