Casemodders can make anything fit anywhere, almost. It's just a question of feeling that it's worth the investment in tools, skills, time, mistakes and cut fingers to make it the way you want.
The stock Antec fans aren't bad at all, really. Sleeve bearings have come a long way. Some of the best fans, panaflos, use advanced sleeve bearing technology called hydro-wave bearings. Good ball-bearing fans are widely available for under $10 each from outfits like 2cooltek..