There are a number of themes which can be customized to look similar to http://squarespace.com.
I searched and found these few themes which can be customized:http://teothemes.com/wp/scrn/ http://teothemes.com/wp/viewpoint/
If you like I can help you customize these themes to match your exact requirements. I can be reached through www.ideasloop.com/contact/
I have checked scheduler on Voiceamerica.com and its pretty detailed work.
Are you looking for all the features of Voiceamerica.com scheduler Or are you just looking to display your daily/weekly radio schedule on home page of your website?
Please feel free to contact me through www.ideasloop.com/contact/
I have seen the themes you like. Funny thing is, I mentioned those themes to another client on themeforest forum one day ago
I dont seem to find your email address to send you more details and costing. Can you shoot me an email through www.ideasloop.com/contact/ ?
I just checked http://www.ktas.com.au/home/ and layout is pretty much standard corporate layout.
Any corporate theme on Themeforest can be customized to look like your reference site. Page layouts like this one http://www.ktas.com.au/tyres/ or http://www.ktas.com.au/tyres/brand/ can be customized as well from any of the page templates in corporate theemes.
I did a quick search and found a few themes which are closer to ktas site.http://themes.themegoods.com/athena_wp/ http://www.mnkystudio.com/theme-9/ http://avino.wsblogz.com/ http://demo.ourtuts.com/line/home/
But seriously, there are 100s of corporate themes which can be customized to look similar to Ktas site.
Tyre selector feature will need to be coded in all of these themes. We can customize the fonts and styles of all the themes as per client requirements.
If you like I can help you in these customization. you can reach me through http://www.ideasloop.com/contact/
Let me know if I can answer any questions.