Replying to Kinda confused and could use a little bit of help

so im looking to get a pair of new skis. i am currently riding the 05-06 rossi scratch fs. and im looking at getting a pair of salomons i have never really been a big fan of them but they have kinda impressed me this year. i dont kno much about them. i am pretty hard on my skis and edges i ride alot of rails and ride about 90% park. so i want a all park ski. is the thruster a all mt twin? or is that the foil? im kind of comparing the Thruster,SPK, and The Dumont. now is the thruster the all mt twin of the group? and is the spk like the all park ski? cuz i have herd that the spk is a pipe ski? and that the eges wouldint hold up on rails? and the dumont is just a all park ski? or wat? can someone explain this to me and give me a lil help here? which ski would be better for me the SPK or the Thruster?