I would suggest spending your money on upgrading your lights before investing in corals. Some mushrooms aren't going to require a lot of light. Most other corals do. The one's that don't require light are going to require feeding that could have a negative impact on your water quality.

When you get your lights, let me know. I can probably hook you up with some good beginner type soft corals like Xenia, clove polyps, and maybe some shrooms.

Gary