I've not had very satifactory results with the Ilford profile for Gold Fibre Silk.
I also have my own profile for GFS, but I think the factory profile will improve greatly in the very near future. I spoke at length to my MAC group rep who distributes the paper in the US, and as I mentioned, all of the Galarie papers are being repackaged and re-profiled, and the profiles are being made by x-Rite. I would assume being the industry leader in color management they would do everything they can to make sure their profiles are exceptional.
I just think buying a RIP for the "advantage" of the profiles really isn't a major factor. Even if you choose a paper which doesn't have a good factory profile, having a custom one made isn't that expensive.
I just don't see any advantage to a RIP for the majority of users, especially someone like the OP who is just getting into printing. Better off using the money for something else ... such as Camera to Print and Screen videos or other training.