A Printer challenge - which ?

[Panjo]

G'day folks
I wonder if you could help, I've been invited to cover some events in the coming year and as part of this I would like the opportunity to print and give each customer a photograph. So I anticipate probably one customer at my area every 15 minutes, and at the end of this mini photo shoot I would like to give them a good quality Photograph of no more that A4 in size, and in turn I hope they would order more and hopefully bigger ones. (I hope all that makes sense). What I’m asking is for your recommendations in terms of Printers as speed & quality is of the essence here.

I was looking at SUB dye printers but there so expensive, but not sure about Ink Jet and what they have to offer (Printers are not my forte I must add if you haven’t already guessed) can you recommend a printer for this type of occasion were I’m going to be able to pump good quality, reasonable size prints out that look and feel professional as well as not costing the earth, is that a tall order?
Cheers
Mark