Too small, need more space

I decide against the 300 sq. ft. apartment.  It was cute, I went to look at it and really liked it.  The fact that it had windows on the south and west walls was awesome!  Unfortunately, it just seemed like it wouldn't be enough room for me...and my stuff.  

My mom mentioned that when I move out, she'll need the extra room I'm using to be emptied to rent it out.  That means I need to find a place that is much larger.  A few days ago I looked at a basement apartment that was approximately 600 sq. ft. and even that seemed small!  Maybe it would be possible, but it would be tight.

I'm thinking I need something more along the lines of 800-900 sq. ft. so I can run my eBay business out of it.  Either that or work really hard at selling the massive amount of stuff I have now so I don't have so much to move.  That would probably be best.  Unfortunately, by doing that, I will be living here longer, but on the upside, I won't have so much stuff!

School starts soon and I'll have less time to do these things.  *Sigh*