Regarding the rice, brown rice is healthier than white rice but it's rare to see it in restaurants, the Thais just don't seem to go for it and much prefer the taste of the White, but I usually go with the brown, you soon get used to the taste.
Regarding ED visa: have you already signed up for a course? If you haven't Pro Language were doing a special offer of 19,000 Baht up until the end of March (normal price 24,000), but I'm pretty sure if you ask for this price they'd give it to you.
Once you have registered for a course and have the official registration documents you then have to leave Thailand and apply for an ED visa. You don't have to go far, you can apply at a Thai embassy or consulate In Laos (I think Cambodia too). I think the Laos application can be done in a day, or at least an overnight stay. The only benefit to flying to Europe would be that some embassies allow you to get a multi entry ED visa, whereas the embassies closer to Thailand tend to only give a single entry.
The difference between a multi and single entry visa (this is my rough unofficial explanation):
A single entry gives you a 1 year visa, once in Thailand you have to do some form of paperwork with your school every 90 days, and if you want to leave Thailand during that year you have to apply for leave at immigration and pay a fee (1900 I think).
A multi-entry gives you a 1 year visa but requires you to leave the country at least every 90 days (or within 90). You can leave Thailand as much and as often as you like as long as you never stay longer than 90 days without crossing a border, and every time you enter you'll get a 90 day stamp until your visa expires. You don't have to do any paperwork or visit immigration and if you do a visa run on the last day of your visa you will get a new 90 day stamp, effectively making it a 15 month visa. You can simply get a visa run van to the Cambodian border, you don't need to fly or stay out of the country any length of time.
The benefit of getting a multi-entry is if you plan to leave Thailand a few times during the year and like the extra 3 months. Great if you like to do little trips away and weekends across the border. But if you plan on staying in Thailand solid for the year just go to Vientiane and apply for a single entry ED there. Several visa shops in Pattaya can arrange you a cheap 2 or 3 day trip for you and help you with all the paperwork making sure it's done quickly and guarnteed - I'm guessing at a cost under 8000 Baht all inclusive.