IMO, good Touraine Sauvignon is usually a superior QPR alternative to Sancerre and Pouilly-Fumé where such Sauvignon based wines excel, e.g. for quaffing with simple shellfish dishes. Taking a look at the list of one of my favourite wine merchants, the cheapest Sancerre, from Reverdy, is about €13 and the most expensive, from P. Cotat, about €25. So it's a no brainer to chose a Touraine Sauvignon from, say, Chidaine at €6 instead. Admittedly Cotat's are amongst the few Sauvignon based wines capable of greater heights and more serious gastronomic use after some ageing.
I don't know Domaine de la Colline. It sounds nice.