Mods normally almost worth nothing when it comes to resale in HK.
You may pay a bit more if the mods are all in your taste. I believe you could get a 07 E90 335i thru private sale at about 360-380k.
E90 335i is rarer than E92/3. It may take you a bit longer time to get a good condition one with your choice of colours. If 4 doors is not a concern, I would suggest you finding E92 as there is more supply and more standard equipment than E90 (sport seats,logic-7, sport suspension,adaptive xenons). IMO,E92 is more roomier than E90,while E90 should handle a bit better.
Good luck with your hunting!