Suspension pack = athricate coloured alloys, slightly lowered, wider wheelbase, etc.. basically makes the car more focused as opposed to the smoother drive you will get without the suspension pack.
Spoiler Pack = adds a small plastic rim underneath the front (splitter) and enlarges the rear spoiler slightly (more gives it a different shape then enlarges it).
Id advise u to definatley get the suspension pack as its something u cant do at a later date, but the spoiler pack its really up2u, have a look at some with and without!