The first problem I see is the age of your motherboard. According to Asus specifications the motherboard is equipped with four SATA 2, 3Gb/s headers/connectors. The motherboard does not have any SATA 3, 6Gb/s headers. Luckily standard 2.5 inch SATA 3, 6Gb/s ssd's are backwards compatible and should work with your motherboard. However, performance will be a little bit lower due to the lack of a SATA 3 6Gb/s header.
Most individuals who upgrade from a hard disk drive to a solid state drive are pleasantly surprised by the increased speed and performance. It is definitely worth the upgrade.
There are many fine solid state drives that perform well. I would recommend the Samsung 850 EVO. It is Samsung's best selling ssd, performs exceptionally well, and has a proven track record.
I maintain an ssd database listed in a sticky at the very top of this forum section. Here is the link:
http://www.johnnylucky.org/data-storage/ssd-database.html
Scroll down to the SATA 3, 6Gb/s section, look for any ssd's you might be interested in. You will see basic information about each model and links to technical reviews. The reviews are divided into two groups - English language reviews and reviews in many other languages. There are no advertisements, pop-ups, or other distractions. It is strictly a hobby.
If ssd prices are a concern and you are located in the United States, then I suggest waiting until the latter part of November when the "Black Friday" winter holiday sales are going on. This year the sales will start a little earlier on November 10th and extend all the way to the end of the month. You'll have to check prices twice a day. Some of the sales will be for 4 hours only or until limited supplies are sold out.