Looking for a short growing sativa

HEy,

I'm looking for a sativa strain that i can keep relatively short easily (about 5 feet or so).

I want something with a really strong high.

I will be growing this strain next spring, I hope to make some f2's http://www.cannabis-seeds-bank.co.uk/sagarmatha-seeds-stuporsonic-2791-p.asp It's very unstable from what I found on the net but there's a pheno that grows 4 foot high like a baseball bat and rock hard buds and has the high you might be looking for.