ANother vote for bottling and seeing how it goes - whats the worst that can happen? Not good & tip it out? Weigh that against what could happen - it becomes a brilliant, enjoyable stout. I'd say bottle that sucker unless its obviously infected.
Anyway, if you're after a good easy stout then just throw a Coopers Stout kit and a Tooheys Dark Ale kit into the fermenter and top to around 23 litres. Should age up quite well after a few months, and doesn't come easier or cheaper than that.
Cheers - boingk