Comparing like for like is probably a more reliable method for estimating how much they're going to cost. Like I say, I figure $900-$1000, although, as illistrated by the Epiphones, could be as low as £800. The MSRP on the Les Paul Prophecy GX is actually more than the Rasmus models, and that goes for £550ish. Realsiticly, and looking at the models around the $950 mark I'd say probably £600-£650. Since Ibanez's price hike, this makes them cheaper than a Japanese RG, with proper pickups and the same hardware as the US Suhrs. They're Plek'd, and provided they do decent QC (I can't see they won't) they should be great instruments.
One of the things that was a pleasant surprise for me while researching this post is that US and UK guitar prices are roughly equivalent at the moment :o