of the two, i'd have the Maser... rarer on the roads, looks better now the aston has dated a bit. But the main reason is the Aston would seem a bit slow... doesn't even have 400bhp to play with in the V8 version - it'd have to be the V12, but then the price goes up considerably.
However, if it was my money I wouldn't have either of those - it'd either be an early manual Audi R8, which has a great high revving V8 up front, or a really nice BMW M6, because 5 litre, high revving V10! Plus has the advantage of usable rear seats as well. Heck, would probably even consider a Porsche over the Maser and Aston.
Either way, looking forward to seeing which way this goes!