I own a Frey+. Just as fun piece of equipment and for burning in cables. It is very good for a budget preamp.
It is good to put as much money into your preamp as possible. Typically for me it has been of equal or greater cost than my amp (over the last 50 years). It sets the tone… and since it works with lower voltages it needs to be of really high quality.
Looking long termed, think about investing as much as you can. Tube preamps are very natural sounding and reliable. Consider a used Audio Research, Conrad Johnson (not older than about 10 years), VAC… maybe (hesitation) Rogue (not in the same league in reliability).