Im after putting coil overs on my corsa Ive done my mates and i know how to etc etc. but what are the best to get.

at the moment im runnin spax psx race kit the adj ones (damer)
lowered 40mm on 17"s with the coil overs ill be down to 60mm all round.

would i be wise to upgrade to coilovers as im doin the engine conversion soon or could i just use the spax that are one? would the be ok or not?
Oh its a valver conversion and it in a corsa sport 1400 16v at the moment

It means a lot of arch work but hey thats part of the fun!

Any help in choosing would be ace

Many thanks