budget and SLI/crossfire don't exactly work in the same sentence. You're better off getting a more powerful card than 2 weaker ones in SLI. I don't recommend multiple GPUs unless you're willing to dish out loads of cash.
You also have to take your current system into consideration, such as available power, space and cooling.
EDIT: right now I wouldn't SLI anything under a gtx 1070. two rx480s in crossfire is benchmarking roughly the same as a single 1070, but if you go that route you'll have to deal with the nuances of two cards.
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