Buying an SSD drive

So, here in Sweden there might soon be a new tax on harddrives for some stupid reason (to much pain to go into detail) which might make the price skyrocket. I have long thought about getting myself an SSD-drive to speed up my shit, and now the time has come (unless I wanna pay double for it at the end of summer). I'm not too familiar with SSD drives, and after looking around a bit, I decided that the fastest way to get some answers would be to ask.

From my experience, a SATA HDD drive of 2.5" is mainly (if not only?) used for laptops, while the 3.5" are for stationary machines. Looking through the net though, I find that there seems to be a huge difference in the amounts of SSD drives that are 2.5" and 3.5", where the 2.5" are not only doubled in number, but also seem to have a many more newer models with better specs, which sounds pretty weird to me.

I'm simply wondering if I might be mistaken when I believe that 2.5" SSD are for laptops, or if there in fact just isn't that many or that good SSDs for stationary computers?

Also, if someone can recommend a good drive I'd be thankful =) My price range is at max around $250.

For a desktop i would recommend a PCI express card like this one for a SSD drive under 250.

For a laptop i would recommend an inter 2.5 inch SSD like this one.

You won't get as much space with the PCI solid state drive but you get higher speeds than a SATA SSD, but if you want a SATA drive here is an alternative