Wow them RR's look like they have terrible fret access.
All Caparisons are farely expensive, though they are a fair bit cheaper then going through a custom shop like ESP, Jackson, Dean etc. There's not much price between them all, except the Quilted Angelus. But yeah it depends really... I'd say the TAT has the best playability out of the 24fretters as it's neckthrough and it's also Alder which I like (The rest are mahogany). The Horus might be better than the TAT's, seeing as it's 27frets which would make it very easy to access the 24th fret. The TAT's still play amazingly though. You'd never have a problem with fret access.
But yeah I personally don't like the look of 27frets, especially me being a small guy and all. If you're really interested in Caparison's you should go sign up on the bmusic.com.au forums (They run the official Caparison forum) the guys there will help you with your decision