All 5 card hands of the same colour: 52 * 25 * 24 * 23 * 22 / 5! (first card is anything, next can only be same color, down to last card; order doesn't matter) = 131,560
Total number of straights: 10,200. Number of straights that use only two suits: 640 (40 straight flushes * 2^4)
Total number of flushes: 5,108
Since the number of straights does not include straight flushes (40) it doesn't need added back in.
131,560 - 5,108 - 640 = 125,812
At this point, one needs to subtract the two-suited pairs and two-pair hands, and it might just beat two pair (123,552)
Go ahead, criticize my numbers.