Reply to Old vs New

I currently have a mixtrack pro and had this for about 18 months. I love it and it has served me well in rekindling my love with DJ'ing however I feel like I need to move on. (anyone wanna buy??)

My issue is that I can't afford a lot so I don't know whether to buy 2nd hand - vestal vci-100 - or try and save for something new (more than likely s2 but will miss big saving.)

Anybody got any advice on what to do?