Oooh nice choices. For Choice #1, I voted Sinister Hollows because I love Murray Atkinson's signature of music that is creepy or suspenseful, and yet has an element of fun. I've not been able to afford this pack yet but I really enjoy listening to the soundcloud samples. (Again, and again... ahem)
Choice #2 - I really want the VX simply so I can have the license, but I voted RM XP because from the brief time I tested it, I was impressed by the mapping layers. The tiles also has this pixel art look many people still love today. I'm totally an Ace girl, but I'm staggered by the sheer variety of tile content available for XP.
Choice #3 - Futuristic Tiles is an absolute must-have, whether or not you plan to make a sci-fi game or not! There's an insane number of slick floors and walls, and surprisingly there are loads of content you can easily use in a modern or fantasy game too, such as warm brick wall tiles, cabinets, plates of food, hospital beds and much more.