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Adding to the suggestions above, the combination of the 370 and 190 is another, less frequent, way to get to Crossgates via CDTA. Take the 370 as far as Latham Farms Plaza and then the 190 the rest of the way from there to Crossgates. CDTA has the schedules timed so that there shouldn't be too long of a delay between when the 370 arrives at and when the 190 leaves from Latham Farms.
CDTA also has apps for both Android and iOS that will let you do trip planning and show real-time bus status for many routes.