Oi!!! Your budget is a $1G and yoru looking at $126 dollar speakers? I honeslty think you would kick yourself in less than 3 months time if you bought those JBLs given the budget you alloted. I know saving money is important but don't cheap out either. I think you would be better off getting a decent pair of speakers and a sub for that kind of money. If you play it right, you may not ever feel the need to upgrade again. I went thru something similar to you having ownded a complete Technics speaker package but I've been teh proud owner of a PSB speaker package and I don't need to upgrade from these again.
Try audtioning some speakers from speciality stores. I own a pair of these
http://www.psbspeakers.com/products/Image-Series/Image-T45-Tower
and few posters saw them for around $500 a pair. These will absolutely blow away the JBLs in terms of imaging, soundstage, natural sounding, and accuracy. They will come close to the JBLs bass but it will be much tighter, more musical, and better defined.
They may not be to your liking either so listen to similar priced models from Paradigm, Mirage, Polk, Athena, Infinity, etc.