Depends on your available funds.
I would submit that TSC implements, either new or used, are at or near the lowest quality implements in the marketplace.
Most TSC implements are currently made by Tarter Gate, which is the lowest cost US implement builder.
If you want a QUALITY back blade, check out the Everything Attachments "6 Way Deluxe Scrape Blade".
Yes: It will cost more, but it is worth every penny (I am not a you must buy everything from EA crazy sorta guy).
I have had three other blades, and the EA 6 Way Deluxe Scrape Blade is more easily adjustable, and by FAR the best!