jremington:
No, as a matter of fact, you do NOT need higher capacity with that motor.If you had actually looked at that link, you would see that the "VEXTA PK243A1-SG18-C4" Motor is rated for 0.95 A/phase. So the A4988 driver is a perfect match.
Of course, I did.
I was worried because I didn't know whether the number which Robin mentioned is per phase or not. So I checked these following links for A4988:
How To Control a Stepper Motor with A4988 Driver and Arduino
A4988 Stepper Motor Driver Carrier
Therefore, I realized that the maximum current/per phase can be 2A.
VEXTA will take about 1.9 A for 2-phase. So there won't be any trouble for A4988.