I think a lot of what you're going to get is too common, but that's just my opinion. Its too easy to find a silver aro, mono pbass and clown knife. Instead of a silver aro, I'd get a leichardtI if I could find one, a kelberi or xingu instead of a mono, and a royal ck instead of a regular one. Or instead of any ck, I'd get a big thinbar dat or some nice geos.
You spent all that money on a tank, you might a well stock it with some rate fish too. Thats what I would do with a 240.
Im a big royal ck fan but I've never had one. Probably wont get one for a while either. I'm afraid my ck is too old introduce another knife and I don't want them on more than one tank.