fender 75 head

Should I trade my amp for another?
I have a Line 6 Spider IV 75 Watt amp and $50 that I might trade for a half stack. It has a Fender FM100H Head and a Marshall MG cab. I like my amp but I need something a little louder for gigs. Also its hard to use pedals with my amp. Do you think this is a good trade?
Heres the ad for the stack: http://atlanta.craigslist.org/sat/msg/1549212134.html
75W is usually ok for small gigs provided you get the combo above crowd head height. The Fender/Marshall combo looks the part but you always take a risk on an unheard combo.
Robbie Hunt (Xactabox w/ D~Roc) / In the End