agree with sdr, no need to buy mature plants, the extra cost can be quite a saving. for example, Japanese Maple 24″ box cost $275, but 5 gallon is only $25.
As for the grass:
[quote=snail]Nice!!! I would change the grass to hardscape, save some water in the long run.[/quote]
Don’t change to hardscape, too much hardscape make the whole yard look commercial. would not do artificial either due to cost and heat and little pallet fillings that pets and kids would like to eat.