I visit Thailand on march 29th for 28days and
was under the impression I would not need a visa?
If you arrive in Thailand by air, you can stay in Thailand for up to 30 days without a visa. You can then only extend your stay by 1 week at immigration and its quite pricey. This is why I was looking into the option of puchasing the 30 day visa.
Free 60 day visa sounds like the go though for me!