MVC :: Using Grid In MVC And Use HTTPPOST?

I want to use a grid in asp.net MVC application. I did an evaluation and found JQgrid to be optimum from performance point of view(minimum posback). What is your views about this and suggest if you have any other grid in mind which performs better and which is free of cost for commercial usage. Also now a want to post data from edited grid back to server from Jquery base JQgrid .Should i do it using httpget or httppost. If i use HTTPPOST, what should i calculate in controller and what in model As per examples available on net, people are putting calculation logic in controller(See article [URL] I need to know whether it is good practice to put business logic in controller rather than restricting it for routing to view and model.

Controller code as given in mentioned website is having following code

public ActionResult DynamicGridData
(string sidx, string sord, int page, int rows) {
var context = new HaackOverflowDataContext();
int pageIndex = Convert.ToInt32(page) - 1;
int pageSize = rows;
int totalRecords = context.Questions.Count();
int totalPages = (int)Math.Ceiling((float)totalRecords / (float)pageSize);
var questions = context.Questions
.OrderBy(sidx + " " + sord)
.Skip(pageIndex * pageSize)
.Take(pageSize);
var jsonData = new {
total = totalPages,
page = page,
records = totalRecords,
rows = (
from question in questions
select new {
i = question.Id,
cell = new string[] {
question.Id.ToString(), question.Votes.ToString(), question.Title
}
}).ToArray()
};
return Json(jsonData);
}

design practice and sample to implement grid with HTTPpost feature