Hi JPCH123 (or can I call you JP for short?

),
Having lived in Atlanta in the 90s (with very fond memories of our time there), I wanted to wish you good luck with your move. The weather here will be similar to what you get in Atlanta this time of year, except of course that we get it all year round. But you probably already knew that.
Regarding your question about shipping / moving companies, we've always used Allied Pickfords and had consistently good service from them, but that has always been to/from the UK and some other destination, so I'm not sure how good they'd be for an ATL -> SIN move. Also depends on whether you want the 'full service' with packing, etc. or just need someone to collect some boxes at one end and deliver them at the other.
Your best bet would be to do a search on this fine forum (look above and to the right). AND check out the link in sundaymorningstaple's signature where there are lots of moving companies listed.
All the best for the move.