You already know my answer to this.
Just to show how fussy I am: when I finally decided to try 5-string in early Y2K, I wasn't really sure what I liked. My first was the great Fender Roscoe Beck fiver: I was comfy on that. Next, I decided to go for something a teensy bit more modern: a Modulus Quantum 5. I owned it for years, but realized that the narrow bridge spacing cramped my style (it was also 17.5mm, I think). I then bought a Mike Lull P5 -- this was before Sadowsky offered one. It had 18mm spacing, and I never got completely comfortable on that, either! In that time I also owned an MTD 535 (19mm) and Warwick Streamer Stage I 5 (20mm), and I was comfy on both. So, when the Sadowsky P5 came out, I immediately grabbed one and the rest is history.
All that said, I know a couple guys who switch between narrow and wide-spaced fivers and don't seem to notice. Maybe you can find a great deal on a pre-owned SR5 and try for yourself?