A inexpensive Off-Set will have you running to your pellet grill as fast as you can. Stay away from the thin metal offerings at the big box stores. Once thick steel heats up, off-sets are off and running. A good base of hot lumps and wood splits the rest of the way and you are all set. The big box store crap can not handle 14-16 inch wood splits. They will warp on your first cook.
Tim is right about Yoder. They are excellent. However, before you pull the trigger call Lillian over at BBQ Pits by JJ. They make awesome 1/4" thick smokers that are priced right. Some of David Klose's ex welders work there. Problem with Klose and Jambo is that you pay extra for their name. Call 713-691-2922
https://pitsbyjj.com/Their pits are as good as anybodys.....trust me.
Even the best made offset will drive you crazy until you learn the pit. Fire management is crucial. You will also need a souce for good dry splits. You can order a skid of splits from Lillian and have it shipped with your smoker.
I have ran off-sets for longer than I care to remember.....from 100.00 to 2000.00 and they make you work for it. After the meat goes in the smoking chamber it is all about managing the fire for up to 18 hours (brisket) but the end result is the best you will eat.
One tip for you: have a flat plate welded to the top of your fire-box. This way you can "warm" your splits before you add them to the coal base. This way they burst into flames and burn clean. Nothing worse than when they sit there and smolder.
Also, do not go for a 16" diameter barrel. Go at least 20-24 inches. You will appreciate the clearance. I also prefer square fireboxes....Lillian can take care of that for you as well.
Pick up Aaron Franklins book. Jaxon got it and it really helped him with his off-set cooking. It is all about fire management.
Do not be afraid of the shipping cost. Shipping a 400 lb pit from Houston can be anywhere from 300 bucks and up. JJ Pits have pretty reasonable costs for transit.
The off-set will be great for you if it is for occasional smoking when you have the time and plenty of beer. You will use your pellet grill way more, with life pulling you many different directions.
Good Luck..just make a good choice. Just don't go cheap. You have to mod them like crazy and they still are not worth the time or money.