Hi I used to live in East side of Singapore for years and now in the UK.
I would recommend Laguna Green (only 3 yrs old)-not many units so is a more private
condo with lesser kids and noises, the Bayshore (the new one), Mandarin Garden. Tpt around this area u can get business bus-plus (a green minbus-cost abt S$5) at the normal bus-stop or public bus no 196 (go by nicoll highway). And all these
condos are very close to the beach within a few mins walk and easy access to Orchard Rd as well with other bus service no. The closest shopping area will be Parkway Parade with foodcourt there too. If u want to take MRT, depend on which direction u are closer to, u can take from Payar Lebar or Bedok.
Another condo which is close to Tenah Merah MRT is very nice too. I cant recall what the name is but u can see along the tenah merah mrt line. A friend used to live there - big space condo with high ceiling - 2 bedrooms on ground floor and the master bedroom on 1st floor with ensuite.
If u need more advice, i would recommend u go to this site xpatsingapore.com and give a ring to Delphina Yap who herself lived in the East Coast for years too and is a agent now. She can help u find any condo u like with her network.