Personally I'd just wait at this point. Valve doing SSD lottery along with Steam Deck being a first gen device means that the sequel should be significantly better. Not to say to avoid the Steam Deck or anything cause it's a great device. But if you already got one, I'd just wait or get something like the GPD Win 4 cause it's much more powerful along with being able to run Windows and having a ton of storage/Ram options.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850