my view:
def comprar(request):
    if request.method == 'POST':
        form = FormComprar(request.POST)
        if form.is_valid():
            form = form.save()
            retorno = 'Intenção de compra computada.'
            form = FormComprar()
    else:
        form = FormComprar()
    total =
Compra.objects.all().aggregate(quantidade_total=Sum('quantidade'))
[ 1 ]
    valores = Valor.objects.all().order_by('quantidade')  [ 2 ]
    return render_to_response(
        'form_compra.html',
        locals(),
        context_instance=RequestContext(request))


template - form_compra.html

Aggregate
{{ total.quantidade_total }} [ 1 ]

{% for valor in valores %}
        {{ valor.quantidade }}
    {% endfor %}
list os results [ 2 ]
e.g
1000
2000
3000

like a :

{% if total.quantidade_total >= {{ valor.quantidade }}

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