Can you even get a HHKB2 for that price? Given that the realforces for for about £160, I would expect the HHKB to be a bit higher.
Also, I really don't think it would be a good choice for an MMO player, simply due to the small number of keys present, as well as the layout differences from a "normal" keyboard. Especially since I don't think it even exists in other layouts, does it? It's a Sun Type 5 layout, which admittedly did have euro variants, but I've never seen a HHKB with anything other than the US variant.
Don't get me wrong, I have one and love it, but I'm a coder, not a gamer, so different requirements in a keyboard.
Personally, I would go with bugfix's suggestion, which is a brown filco. I personally don't like them, but people here love Cherry switches, browns especially, so it's a good starting point for most people, I would think.
Also, the Unicomp is only 2KRO, which for my purposes is more than sufficient, but may not be for you. It's also quite loud. I love it, but others don't like the noise. They are also kinda pricey to ship to the UK.
You might want to ask around, there might be other geekhackers in your area that might allow you to try the different switch types before you make a decision.