Can any learned colleagues recommend a specification for monitoring solar thermal output remotely?

we'd like to monitor:
collector temp
cylinder temp
useful solar energy delivered to the cylinder
total DHW usage (volume and temp)
pressure drops in solar circuit

the problem we've found is this:
1) you can use extra bits of resol kit that talk to the controller, plus a wireless broadband router.... cost is £400+....too much
or
2) some nifty and cheap temp, pressure and flow sensors but they're commercial and need an expensive data logger or mini bms system to interpret... cost £800 plus

both of these are too much for a domestic install.

thanks for any pointers!

If you fancy a DIY approach:
- Any cheap, low power PC, e.g.: Asus EEE on fleabay or http://www.mini-itx.com/store/?c=43
- 1-Wire USB adapter: http://www.hobby-boards.com/catalog/product_info.php?products_id=1503
- Temperature and/or humidity sensors: http://www.hobby-boards.com/catalog/index.php?cPath=22
- Time and patience

The advantage over embedded solutions is that you're running the system off a full blown PC, which leaves you many options for expansion and communication.

Squidbee: http://www.libelium.com/index.php?option=com_content&task=view&id=14&Itemid=60
It's based on the open Arduino platform and the entire design is available online, so if you fancy it, you could build the whole thing from scratch.

You can use the squidbee for remote sensing and then attach a USB gateway: http://www.libelium.com/tienda/catalog/product_info.php?cPath=22&products_id=35 to pull the data into your pc.