its basically a virus B in a new red casing, the differnces between the b and c arent great although i imagine you oculd pick up a good nick second hand C now for 5-600 quid.

i own a C myself but personally id now rather own the powercore card with the virus plug in just because its more flexible.

if i were you id either seek out a s/h virus B which is gonna set you back about 300-400 quid, or if you read on up on the extras with the C and decide that would be better for oyu then again pick up a second hand one for about 500 ish ;)