Devialet and Jamo R909s: 400s or 800s?

[MusicFirst]

I recently auditioned the Devialet 200 in my system driving Jamo R909s in a 18x14x7.5' listening room. The amplifier was, in many respects the best I've ever heard but the system needed more power.  Unfortunately my dealer does not carry either the 400s or 800s, as he is a small store he only stocks the 120 and the 200.

My question is, will the 400s meet my needs or do I go the 250 route waiting until I can afford a slave for 800 monoblock operation?

Thanks

Kerry