What is your budget re: accom?
We've mostly stayed at Sheraton, as it's right on Nathan Rd at TST, so it's close to transport (MRT, bus and Ferry)
For a bit cheaper, you can stay across the road at Kowloon Hotel (it's Opposite Pennisula Hotel) but the rooms are extremely small.
We've also stayed at the Langham, also at Tsim Sa Tsui, and it's pricer than Sheraton, but it's opposite Harbour City and closer to the Ferry
March is not sale time i'm afraid, though you'll never know with the economy being as it is, but HK is not cheap any longer