Hey no problem!
And I can't compare cause I've never scanned my pictures over at Ruby Photo nor at Fotohub. The prices they charge are too expensive. I do it at home with my Canoscan 4400F, although quality isn't that good. You could scan the negs when you're back home?
And for those high sensitivity film, I've never seen Portra 800 in Singapore. As for the Fuji Superia, I've seen some 800s over at Triple D, Burlington Square beside Sim Lim Square. As for the 1600 ISO, I haven't seen it either.
Anyways, Sim Lim Sqaure is a GREAT place to buy electronic goods. Loads of computer parts, flash cards, mp3 players, etc over there.
Again let me know if you need any more help! Also, when are you coming over to Singapore?