I'd definately stick with
www.acerracing.com bearings. The prices are really good for whatever bearing you want, be it high end or low end. And besides..they've the best bearing model you can find on the internet (just look at the tshirt section) Also, teamblue star bearings are okay...I mean their not exactly what I call the best out there but for 5 bucks more, I'd get the comparable set from acer myself.