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If it's just a shade you're after then i would say paper is the way to go. You want something that'll disperse the light in all directions but also won't look oppressive when the light is off. The Akari range do have some low profile offerings but they're still very expensive.
Not sure what rooms you're putting them in but you could consider suspending them over furniture (low table in seating areas or over beds etc) to avoid the obvious head height issues. I have low ceilings so suspended my PH5 over a low table which looks nice but i'm about to swap it for an IKEA paper pendant to get more light in the room.
I'd start by getting a decent light source (bulb) no warmer than 2700k with an all round glow (Calex do a high output opal) then as per the suggestion on the previous page get an IKEA to see how well it works. If it's good for you then it'll be worth saving up for the low pro Noguchi. If it's still dingy then i suspect the room is too big for a single pendant and you might as well hang whatever looks cool and beef up your low level lighting.
@jono84 - the natural light is ok, but its an old place so small windows etc. We typically don't really use ceiling lighting unless its a super dull day (Scotland so quite often)
I like Noguchi style, its just the head height I need to consider.