I have also just gone down the 3D route:

Paid £1399 for 59" Samsung TV with 2 pairs of active glasses and 3D bluray player plus Megamind 3D bluray and a 5 year warranty, already have a PS3 which is 3D ready, bought 2 extra pairs of glasses one at £50 and a pair of the next model up for £80, so as Silverfox said there are bargains to be had.

As for the 3D itself I find it really good and the Mrs and kids love it, there is also the ability to convert from 2D to 3D which is also quite good but I find it best on a full HD source.
I have not had to replace any of my cables as I dont need the Audio Return Channel in a HDMI 1.4 cable and everything is fine.

Purely for experimental purposes you understand I went to certain HD adult channels at 13E and switched on the 2D -> 3D conversion which worked very well but it was a bit disconcerting finding certain bits of anatomy waving round the room