Welcome
Everyone else is chipping in on the cars, so I shan't. But just be clear on the spec you're looking for as it can trip you up. 'Si' is the engine designation, and is applicable to all facelift (2006 on) cars with the N52 engine. SE and Sport are the trim levels. The Sport has better seats (IMO), sport springs that are lower than SE by about 15mm, and also a chunkier M sport steering wheel with black rather than silver trim. I'm sure there's other things too that I've forgotten. So you can have a 3.0Si SE for example - make sure to check carefully if you've any doubt because independent dealers in particular can get the designation wrong.
Good luck with your search
Everyone else is chipping in on the cars, so I shan't. But just be clear on the spec you're looking for as it can trip you up. 'Si' is the engine designation, and is applicable to all facelift (2006 on) cars with the N52 engine. SE and Sport are the trim levels. The Sport has better seats (IMO), sport springs that are lower than SE by about 15mm, and also a chunkier M sport steering wheel with black rather than silver trim. I'm sure there's other things too that I've forgotten. So you can have a 3.0Si SE for example - make sure to check carefully if you've any doubt because independent dealers in particular can get the designation wrong.
Good luck with your search