Jim get yourself some decent drives as well. They make a world of difference. The 70v chinese ebay one's are pretty shit compared to the digital drives. I can't see why anyone would use them after experiencing the digitals. Leadshine AM882 is a good starting point.

I've got 1.5m long screws, one a 1610 and the other is using dual 2010. With the AM882 and 75v I have no probs with 10m/min and high acceleration 1m/sec^2. Before with the cheap chinese 70v's I was lucky to get even 4m! Rubbish.

I'd go 2010 for the X but either 1610 or 2010 is fine for the Y.