Budapest stags did a great job organising our stag weekend for a large group. The guides (I have forgotten there names!) were absolute stars and got us out of trouble on a few occasions. Great activities pub crawl, steak and stripper. They also organised an excellent medieval banquet for us. The only bit of advice I would say is pay in cash as paying by card adds on quite a bit to the final bill if in a large group as the banks exchange rate is not great!!!
But would definitely suggest go with Budapest stags...