layout and compatibility

Please two more questions:
1) what about hosting ? is there any particular needs with working platform ? Joomla version, SQL version, PHP version, and so on... ??
2) my website (which you can see at www.aviorama.travel ) is built up from a GAVICK template: I cannot imagine which page a registered user could land to, when going to see and download documents prepared for him ....

Many thanks once more

Hi Gino,
1) OS Property can be installed in Joomla 1.5 Native and Joomla 2.5. You need to have php > 5.3 I suggest you to use Bluehost. It has the good services, and supports Joomla php and mysql (all versions)
2) I think the best template is JA template.
Thanks
Dam