Not sure if I have enough oomph.

Why not wait to hear the set up before going off in search of another amp?  I cannot think of a speaker that really "needs" more than the 240 wpc you can get out of the Krell; if the sound disappoints, it is not for lack of power.  

Try it with krell if don't like it bi amp it use krell for base and find a amp for the upper end I have the salon 1 and like it.im running 1k through it.it may be people aren't running enough wat5s through to get all the speakers singing.i have not tried the tube amp on the top end yet.so much fun not enough time.have fun you'll like them and enjoy the music

For an arena? No, you don't have enough power.

For the average home listening room?  You'll be just fine.

Of course the power requirements for just about any speaker depends upon not only sensitivity but also the type of music you listen to & at what volume level. if you like your music loud n a big room, you’ll use every bit of what you have & could probably benefit from more power. 
 

there is a difference between being just fine and being able to feel the low end thump that comes from having raw watts in your amp regardless of volume ... I think your underpowered for the speakers to truly shine