I also recommend to not go with major design overhauls to make it look web 2.0. I use Bootstrap a lot, but it's simply not what will work with the Bitcoin community. That means, don't start your project off with Bootstrap's large empty spacing, font size, large buttons, white/grey/black palette.

Making something more web 2.0 has disastrous results for a technical internet community. DigitalPoint migrated to the latest version of vBulletin which is like the direction your UI is going. Take a look at how they are doing:



You can quite easily see that after upgrading their forum to be more web 2.0 / shiny, their userbase stopped visiting as much. They had to move to another forum software that was more traditional, and better for "power users".

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It should also be noted that Google will penalize you if you serve a different version to GoogleBot. See this video: http://searchengineland.com/library/search-engine-optimization/seo-cloaking-doorway-pages

Your crawler interface will get your forum software significantly penalized - Google cares if you serve it a substantially different HTML, it can't detect if what you are doing is "reducing bandwidth" or whatever - if a diff is significant, you get slapped with a hefty penalty.