Micro 2000, one of the long-time Apple authorised service centres and certainly one of the best if not the best, is apparently moving out of their long time location at BMW Performance Centre at Alexandra. They are now at Sunshine Plaza, and will apparently open other branches elsewhere in the Republic. Will update with more info and the official address soon.
Usually I like to recommend my friends to go directly to iShop for servicing, due to the general dislike for the other Apple authorised reseller in Orchard, but ever since the other shop outsourced the servicing to Diversitec/Sapura, word has it that the service has improved.
However, since Micro 2000, easily my first choice for servicing, is now at Sunshine Plaza, there is no reason for anyone to go to either iShop or Epicentre to do your servicing. Just pop down to Dhoby Ghaut!
Edit: As noted by _dren_, Micro2000’s main office is also moving out from Alexandra Road and shifting to Joo Seng Road.