Yeah I use prismas those are pretty pricey too. I'm intimidated by markers for some reason (funny right? ^^; )but your pic of your has inspired me to practice more with them.
Do! Trias are really good, they don't bleed half as bad as prisma colors. If you are worried about ruining your line art you can scan the picture and print it out on torn out sketchbook paper to practice on, as printer paper is impossible to marker on....