I noticed a performance boost putting Launchbox on a solid state, but there isn't much you can do with 30 - 40 gigs. Ultimately, this is going to depend on how much stuff you're intending to put into Launchbox. If you're the type of person who has small lists of games you play and only import a few per system, go the SSD route. If you're full list on everything, definitely use the HDD. I have nothing but LaunchBox and Artwork on a 500 gig SSD and I only have about 100 gigs left. You could attempt to save some space by not downloading videos or manuals, but it sounds like you should probably just use the HDD. The performance isn't bad and there are entire threads on how to speed it up.