The motor mount is definitely nice, but unless you flog the car you may not notice a lot of a difference. It does make a difference when you shift, you will notice it when you let the clutch out. But unless you shift the car hard often you will not notice a dramatic difference. If you're the kind of person who does not want to do many mods to his car, then you also might not be driving it very hard and therefore not get the benefits of this upgrade.
In my opinion a much better choice if you want something simple that will make a difference is a quick shift kit. I bought the Boomba one, for $80 and a very easy 15 minute install it makes a very noticeable difference with every single shift. That would be my suggestion.
Also, since I installed my cold air intake I have a Cobb panel filter for sale, it is barely used and would be a nice addition if you're looking for something affordable. It has much better airflow than the stock air filter and will gain you some intake noise as well. If you're interested let me know, I'd be happy to sell it to you for a fair price.