Although the RME cards are definitely some of the very best in the business (along with Apogee and Metric Halo, UAD etc.), they are also some of the more expensive.
I would honestly advise that, unless you are doing professional work that demands the very highest standards, you can do VERY acceptable work with audio cards a lot less expensive.
Like the Tascam US 144 I currently have?

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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.