@devil
...can`t the stock suspension go on for a longer time with these wheels...
As said earlier. Use the stock suspensions to their normal life (naturally their life is less as comparable to heavy cars). Afterwards, you have good options.
Actually, Japanese Alto shocks are far better then stock, but there is the catch, if you cannot recognize a good working suspension, you could end up with crap (I am talking about second hand options).
So considering the circumstances, it is reasonable to use stock suspension till their end and then replace with imported ones.