Should be alright..use the search button mate. Theres a guide to how much wattage you need to do what with. And how many speakers if I remember rightly..
im interested in that thread, but can't find it... can you link to it?
My Guitars:
Gibson Les Paul Studio
Epiphone AJ
Ibanez Strat Copy

Orange Tiny Terror Head
Old beaten up Peavey cab
Marshall MG30DFX
Hmmm most talent shows run by schools, businesses and clubs get you to set up your amp and then use microphones and such equipment to amplify your sound even more. So you should definitely be good to go.
My Gear/Equipment
Gibson Les Paul Standard
Burns or Power Slinky (heavy)
Zakk Wylde signature wah pedal
crappy 10watt robson amp
Acoustica Mixcraft on the pc for recording and all other effects.
Blues, Funk, Blues based classic rock.