TRUE are having problems sorting me out a connection, something to do with the fact that they are over-subscribed in my area I believe. That leaves me with the option of using ToT as my service provider (they have my telephone account already), however for a 1mb line they want 1k per month, and I don't even know how realiable they are. What other service providers could I contact, which might offer me a better deal?

I just found this, so I guess I give TOT a go.

How to Set Up A Broadband DSL Internet Connection in Thailand

If you don't have a phone line yet, then you have all the options in the world. Just contact either:

True, www.TrueCorp.co.th, 02-900-9000 to order

TOT, www.TOT.co.th , Telephone Organization of Thailand

There are many ISPs in Thailand, but as of 2007, most of them still lease bandwidth from one of the two companies above.

I recommend True. Their English is better, their support is better, and True has worked well for me at both my suburban office and my home. We were forced to use TOT at our office in central Bangkok and it is terribly slow and intermittently fails, whereby all our staff often can't get work done TOT, and their support is careless. As of March 2007, we have suffered this for more than 6 months already with TOT. We have used True with very good experience for several years.

http://www.thailandguru.com/infra-internet.html