Eh, grow some really tall sativas?:) I don't think it would have a big impact on the right size of container for your plant. You could be fancy and get a
gavita or
nanolux light, you need the height for those and from what I gather they are friggin awesome. Can't find the thread, but sounded like the
nanolux they advertise on the right margin of this page is a bit better and cheaper, maybe had better customer service as well.
Not sure what sort of container you are using, but I use like 7-10 gallon grow bags filled less than half way (maybe a quarter...basically two or three gallons worth) with coco. I like having the wider base for my plant, the narrower containers can tip.
ps. you might want to give ghost train haze a run if you can find seeds still. it way overgrew my tent, would have really flourished with tall ceilings, the thing just gets massive and I think it is always going to bug me I didn't get to give it a proper environment. just thinking of ways to take advantage of your space:)