Im really looking forward to the Quantum Fireball Plus AS as well, I hope Maxtor doesnt screw that up. They might as well just release that drive under the name Maxtor, but again the deal wont be done until early next year.
WD already has a 20gig/7200rpm out, sadly its access time is worse than all three IBM/Maxtor/Quantum who has smaller platter size.
Quantum is considered the king of seek times and I have to acknowledge this. You're absolutely right that Maxtor has that middle of the field type of performance, but their transfer rates are usually very decent, better than WD and Quantum in many cases. If they can get their seek times up there they can really have a good fight with IBM. I hope Quantum and its former partner, Matsushita-Kotobuki Electronics, can help this newly formed company make faster, more reliable and cheaper hard drives.