You don't have to get a new suspension with new rims, but it is advised since you will have that ugly fender gap. If you have money, go for coilovers, but other than that you can go for Eibach's, H&R, TEINS. You don't need coilovers. It doesn't matter what rim size you get - 17's and 18's both work well.
Btw, your link is not directing to the wheels you are looking for.
hi atomic, i'm a newbie but i've been following this forum since months ago. So finally got ur impul installed... you car looked tight already and now even more standout with the kit. Looking real nice............ i am jealous