Hi Braindoc
We've stayed fractionally to the east (Mezzzane di Sotto) in a very nice but fairly priced agriturismo called Massimago. I'd recommend it, especially if you like a little more luxury in an agriturismo, but without breaking the bank.
That said I don't think you're out of the way in Tregnano, indeed that area nicely spans the red dominance of the west and the white dominance of the east. Neither should be ignored.
Very close to Tregnano, in Illasi, is Marco Mosconi. Good Valpol & Soave from memory, but the Recioto della Valpolicella was in our view stunningly good. A proper vino di meditazione. Nearby Trabucchi have a Napa-like attitude to tasting charges, which our group of 4 balked at. They do employ a famous wine consultant, which might be a factor.
In Mezzane di Sotto Roccolo Grassi have that seriousness of a producer that's driving to improve. The Valpolicella is IMO stunning value and a very good wine indeed. Everything else they had was very good to our tastes, and in keeping with that serious attitude, they were playing down their Soave as 'not the best terroir', yet it was a fine example. High quality at mid-range prices.
Across in Soave (actually the nearer Monforte d'Alpone), in what seems a suburban location, Gini have a remarkably wide range, including indulging the owner's passion for Pinot Noir, yet it's the Soave wines that impressed. For me their Contrade Salvarenza from old ungrafted vines is as good as it gets in the region - including better than Pieropan La Rocca (though again, that comes with a 'to my tastes' caveat). Soave itself is a charming little place, that I'd love to spend longer than we had. A lovely day trip option.
Meanwhile in Verona, get directions in advance for Bottega del Vino (it's slightly hidden away in a sort of internal courtyard), and consider reserving if planning to eat there, though we got a table at lunchtime just turning up. It's highly reputed for it's wine, though I'm not sure it entirely lived up to the very lofty expectations (magnum sized glasses for a smallish pour was a bit silly). However the food impressed immensely and not through being pretentious or indulging flights of fancy, but rather doing whatever they did with great produce and with the skill to bring the best out of the flavours.
Thinking about 3 days, I think
1. covering Tregnano, Illasi and Mezzane di Sotto would be a semi relaxing day of not much driving.
2. Soave/Monforte d'Alpone gives you some fine whites (Pieropan, Anselmi and others can add to Gini) plus a place that is pleasing on the eye in it's own right. Moderate driving and a chance to stroll around the small historic city
3. Indulge that original intention of a day trip west to taste more, or pop into Verona. FWIW I wasn't greatly taken by Verona, but would like to venture away from the immediate centre to see if what I felt was a little blighted by mass tourism, was really representative of the city. Based on your original thoughts I'd lean towards a wine only focus on this day and to go to the places you want to go to. If you go their and also to Roccolo Grassi, I'll be interested in your comparison as I think Roccolo Grassi should offer very good competition.
Regards
Ian