My rear bearing also went the other week, it's surprisingly expensive compared to on other models.

Wouldn't worry about doing the spacers at the same time, once you've had the brakes off once it's very easy to do again.
I got OEM grade pads (EBC Ultimax) coz they were cheap, but an upgrade to greenstuff etc would probably be good as they're not too costly. Other brands seem quite expensive. I think it's not recommendeded to just put uprated pads on the back with lesser pads on the front though. from EBC...

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2005 Fiesta ST - wrote off
Newman fast road cams, Fusion Fabrications custom inlet manifold, custom exhaust