You can only switch to the $50 CHOICE plan if it's currently available in your area. Different areas have different plans. Changing plans on your current system would not require a technician to come out.
Also, if you are able to upgrade to the latest Jupiter Technology, that would be your best option. You would need new gear and a technician visit, but you should lease the equipment, not buy it.
Also, if you sign into Dashboard here: http://my.hughesnet.com/ then click on the Support tab there will be an upgrade link on lower right. Go there and it will show plans available to you, you can downgrade there as well as upgrade.
Welcome to the community! After looking at your account, it seems that the only upgrade offers available would require a hardware upgrade. Fortunately, since you've been a customer for a long time and you're already leasing your equipment, there is no cost to upgrade! You can order, pick your plan and schedule your visit all from http://upgrade.hughesnet.com