I had a cheap Spin doctor truing stand (built quite a few wheels on it) for a few years which I passed on to my nephew when I was able to snag a used, slightly better Minoura (from a seller in this forum), which the Spin Doctor was supposedly based on.
The Minoura has a better feeler caliper portion that adjusts with a single adjuster wheel, plus Minoura includes a centering T gauge to help center the caliper to the stand before you start working on a wheel.
Not as robust as a Park, but it works great for the occasional wheel build and truing. Fols and stashes away nicely in my tool bag too. If you want to really spend on tools do it first on really essential ones like a good repair stand, as such will give you much more bang for your buck compared to other tools like a truing stand.