^ you can use it with an M-Audio interface... the fast track USB is only 99.99 on Sweetwater.com... and like Kavie said you can use it with many different apps (Sonar, Cubase, Sampltiude, Live, Reaper, Audition, Acid, Soundforge...ect) until you find the program(s) that's right for you...
...but yeah, from personal experience - anything Pro Tools that is less than HD can be limiting... just the fact that they intentionally cripple their LE and M-Powered platforms (i.e. stripping them of delay compensation, OMF support and imposing artificial track limitations) is more than enough for me to avoid 'em.. but I've heard rumors that Digi is gonna change their buisiness practices soon ... but I'm not holding my breath...