Gotcha. You know - I would try it that way though. The difference between 212.5 watts X 2 (chain your subs together for 4 ohm load and then run one side at 425 watts) and 300 watts X 2 probably isn't that much. Saves you from buying a crossover and solves the problem of the mains having the low end in them.
Sounds like a plan. I'll give that a shot. Thank you all for you help and consideration. I appreciate it!