Windows for reno - cheap options? standard sizing?

Partner's reno will require 4 sliding glass windows of different sizes and purchase needs to be made very soon.

Second hand windows were considered but most are very dated styles/colours and are priced around $150. Online new windows don't cost much more ie $224.

Anyone bought online with success? (looking at 'onlinewindows.com.au' site)

Colours: would white window frames or silver (annodised aluminium) be the 'safer' option as far as keeping a neutral look?
Colour scheme inside will be antique white, but the colour of the weatherboard-look cladding outside is yet to be determined.

Also, builder gave some flexibility with sizing but wondering if there is a 'conventional' or optimal size for

1. ground floor 3 x 3 bedroom
2. kitchen window
3. bathroom window

Thanks in advance.

Any other tips regarding windows welcome.
 
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