SSD, I7, dedicated graphics, dual boot, etc, etc...........All those things are nice to have for the computer geek and will make for a nicer experience but it isn't a necessity for the average comp sci course. Almost any modern laptop will do the job really, Uni labs will provide access to anything fancy you need.
By all means get the best if you can afford it but don't go blowing half your loan/grant on high end kit if you can't.