[Nviduum]

Should be 195/45R15 in Dimension if it's the same as for Applause I. Also you can try 205/40R15 but these ones are expensive. Look for Daihatsus Accessories catalogue, there should be some Aluminum Rims so you have a concrete proposition for the exact dimesions (Applause I has Rims in 15" and width of 7J)
Lowering the Chassis is a good idea the little decrease in confort is egalized by a good increase of stability and much less "body roll"
The Kayaba Shocks are a good choice althought we had some Users here which had problems with leakage shortly after having them installed (several thousand kms) well you will see. If you switch to H&R lowering springs you also should chance the upper spring mountings this also makes a sensible difference