depends on what you buy. dvi-d can carry a better resolution than vga for sure. hdmi and display port are even better. if you're gonna buy new, then an hdmi or display port is what you are looking for. dvi is also getting to be old tech and should be slowly dying as well. some newer cards have even dropped this output and only have hdmi/dp ones.
a cheap adapter for now until you buy a new monitor is good enough for the moment