My general advice would be don't, sleeve bearing fans have become popular because, they are cheaper and they are quieter, although they have a shorter life span.
The other major issue is that they are more fragile, easier to be damaged in transport.
Although not many fans are true sleeve bearing now, because a true sleeve bearing don't use oil/fluid, where as most fans now use a "hydro / Fluid Dynamic" bearing where a sleeve bearing have some grooves cut in it and oil/fluid added.
This means the bearing no longer works by degrading the surface layer into a powder and running on that as a dry lubricant, which means a harder more robust material can be used for the bearing rings, leading to longer life spans and less shock/impact damage.
For low cost + low noise the Bitfenix fans are great http://www.specialtech.co.uk/spshop/...pid-12718.html
Up the cost slightly and the Fractal design http://www.scan.co.uk/products/120mm...ber-fan-mounts and new antec true quiet are good http://www.scan.co.uk/products/120mm...2-speed-switch both also come with added anti-vibration mounts.
For a ball bearing fan the Akasa Amber is still your best bet http://www.scan.co.uk/products/120mm...-and-long-life although you'll need to slow it down to get it really silent.
Fan controller, a simple 3 knob 3.5" bay controller the AKASA AK-FC-06 http://www.scan.co.uk/products/akasa...2-usb-20-ports which also has 2 additional USB2 ports which plug into the usb motherboard header.
Don't forget the good old resistor based reducer Zalman do a 5v one http://www.scan.co.uk/products/zalma...our-3-pin-fan) Sharkoon also do a 9.5v version http://www.scan.co.uk/products/shark...rpm-and-noise) which will slow down a fan but not as much.