CanuckGuy, I just got done with a 9 month consulting gig in HK this March and the firm I was working with had me check out apartments with the providers listed above, studio studio, and cozy and I ended up choosing a place in Sheung Wan at 115 Wing Lok St, and if I would have known about 141 before I left, I would probably not returned to the US with much money as their are plenty of WG flats all within walking distance.
The City loft apt
http://www.cityloft.com.hk/ i took was one of the larger more functional layouts of all the ones I looked at with an actual shower separated from the toilet, most of the wan chai and causway bay ones I saw were decent but i was planning originally on a 3 month stay so wanted something I would be comfortable in.
City loft offers full cable, movie channels, internet (non wifi) dvd player, wet bar, my company let my lease expire twice, and being as cheap as they were, had me stay in the The Anne Black YMCA in Mong Kok for a few days until they could find another apt, and also the IBIS in North Point so I assume those are budget hotels that might be priced ok.
After the first time I had to hotel it I was able to return to my same building, but when they forgot to renew again, I did check out another City loft building a few blocks down on Wing Lok, (which im quite certain has WG in there now after looking at 141, but it wasnt too nice and ended up in a studio studio apt a few blocks up on queens road central. decent layout, had a lounge chair, but shower and toilet were combined but no second sink outside of the bathroom sink....wifi, dvd, but only THREE channels on tv.
hope this helps as someone who is VERY familiar with the service apartments after 9 months in them!
Both providers are easy to deal with and I think you could just contact them with your price range and they can let you know what they have if you dont mind exactly what part of the island you are in or what the layout of the room is, otherwise you would want to maybe to a day or two in a hotel and make appointments with all the providers to show you what they have as they can be quite different or even odd in small size and layout.