I'd say 400 would be more than fair, that's a whisper filter on the right and I'm going to say an AC50 or 70 on the left so roughly 100 bucks for both. the tank is worth about $150-200. the stand isn't worth anything lol, I'd pay 50 for it just so I wouldn't have to build one. Offer her 400 and see what she sa ys, worse case she says no lol