As with many things in life you get what you pay for. Breakfast - especially a fulfilling one - is no exeption. You simply cannot demand such a meal for under 200 THB.
Many years ago we lodged after trying many other hotels in Pattaya in tha Avani whie on holidays if in Pattaya..They have a very good breakfast. But it now might be above 1000 HB. When I say good I mean all European standards like cereals, saussages, egg station (poached eggs may be ordered), but as well a japanese corner, a Thai corner, fresh juices and fruits and maybe indian curries.
If the Avani does not suit you, there is Casa Pascal just opposite. Famous for a reason.
The best setting we ever had was in the Centara Grand in Hua Hin with its quiet nice garden where the birds sing. Drawback: they givve you Allowrie as butter as many others do.
The most vast selection I have ever seen was in the Amari Watergate. You better bring your roller scates. Its a bit leaning towards indian (the owner is Indian) but a bt chaotic and not so clean.
Conclusion: budget 1000 THB+ per person and when carefully selected, you will get a perfect breakfast