As long as it's a HDMI 1.4 spec cable, you should be ok for 3D.
I know many people have their own opinions, but I've spent the best part of £700 on a plethora of HDMI 1.4 spec cables (all 1m long), and I cannot tell the difference between a cheapy branded cable and a £240 cable.
I took another cheapy cable and mangled it across the entire 1m length and tried bend and stretch the connector ends too, and yes a really badly damaged cable and poorly terminated one gave me artifacts until I destroyed it beyond the point of no return and I got nothing on the screen. Hardly scientific, but I'm assuming that all my cables worked to spec out of the packet.
I bought them all discounted on ebay so when I sold them on, I didn't lose too much money and feel too bad.
I bought a few Audioquest Carbon cables recently for little over £30 on ebay and I still can't tell the difference between these new ones and my VDH Flat and Chord Supershields, which offered no noticeable gain against the VDH Ultimate I sold last year.
Spend what you think is sensible.
I've now been on Sky HD for a while and while I can see a HUGE difference between my top of the range IXOS scarts and the standard Sky HDMI cable in standard def mode, I get the feeling there's more to be noticed when you change your source or TV.
I only found this out when my last Sky HD box started to fail and the engineer came out with their latest Amstrad unit, as I told Sky I wanted to quit because they wanted to charge me to give me another replacement unit, so they gave me a new 12month contract at a heavily discounted price along with a new installation.
I was so surprised at the difference, I asked the engineer to plug my other older SkyHD box in (as I have multiroom), so we could see them side by side and yes with the same cables there was a massive difference. The latest SkyHD hardware is great, also operates faster too.
Anyroad, I've gone slightly off topic but hope I answered your original question. HDMI 1.4 spec will do your 3D requirement just fine.
The final decision on how much you spend is up to you.