I was looking at RSM & Nano Cubes with HQI but ended up going with a Solana HQI as I could leave it open top to reduce heating issues.
In fact I have no over heating issues even with 3 powerheads & the 150w HQI running.
Solana Cube
With the Solana, you could add a 250w Sunpod of 150w isn't enough for you.
I do recommend it if you're after an all-in-one & don't want a system with a sump.
Another great system to look at is the
Cadlights 39.
I'd love to sell you my Solana & upgrade to a much bigger tank but my other half will actually kill me!
.