Unless you think you'll need to buy some new players in the coming weeks, I'd go with as many as you can afford.
I know I'm a bit late to the party here, Matt, but I'd take Tutori's suggestion and reduce it a bit. It never hurts to have a bit of money on hand in case the need arises (long injury, new staff, etc), so I've always recommended expanding by about half of what you can afford. You can always add more when that's done if you need to.