In Spanish your choice of short or long trilled R is meaningful, for example: pero and perro have different meanings (but and dog). But not in Russian. So you can say Пррривет! and no-one will fault you for it!
LurkingDarkness- if you're having trouble with palatalization, try to find a native speaker who can help. It is extremely difficult to explain the differences in print!
Рак за руку Греки "цап"!