All of them please. It would be awesome to stand up on a motorbike, inside a 4d cinema rolling down a 200+ foot vertical drop. And the entire thing should be indoors.
In seriousness, though:
- Vekoma Motorbike Coaster - out of the question, I sincerely hope that. If not, it better be extensively themed. If they have the budget for a Hyper, they surely can shave off some 30% (guess a lot of it is a loan, so they would only aquire that much if they were to get a Hyper) and still have plenty of money to build a Disney-level-theme small coaster.
- Indoor coaster - more likely, but could still be very good if themed enough. Probably the option with the lowest running costs, but fairly expensive to put up (unless they pull a Dark Knight)
- B&M Stand-Up - Next generation? If these still are around, they could be Georgia Scorcher over again. Or they could have done like the Dive Machines, and got a reneissance with different seats and layouts, and surprise us completely. By the way, the glaring similarity to Khan might be an issue, if they don't market the stand up aspect of it extensively.
- 4D cinema - meh. If so, it better be awesome.
- B&M Dive Machine - This is the grand winner. Huge, high-profile, visible from miles around, big capacity, vertical drop, one of the first in Europe, etc. Thing is, it's extremely expensive.
- Hypercoaster - Requires room and money, lots of both, but would be a rider favourite. It can with a little effort take the height record in Europe, has a high capacity and is based on well-tried technology (which hopefully means it's reliable). Also easy to spot and market.
Hopefully, there aren't many tourist NIMHBYs around there. If so, they have nothing to do in Salou anyway.