I think tripods are one of the few things in landscape photography where less is not more. For someone who has put this much time and effort into taking landscape photos, and critique at NPN, you owe it to yourself to try a good sturdy tripod. I think Harley and I were both gently suggesting that compact, flimsy tripods are just a waste of time and money. I wish someone like Harley had told me “Buy once cry once” 30 years ago when I first started out.
I too have an old Gitzo 1325, it’s still going strong after many years. Brand is less important than design. Go carbon fiber instead of aluminum, they weight less and are more sturdy. Get one without a a center column, they are less stable. Get a decent ballhead to go with the tripod, they make things more flexible than you might think. Tripod newbies seem to love ballheads with a pistol grip to go from horizontal to vertical. Big mistake, they are very clumsy to use. Get an Arca Swiss style plate L bracket for your camera instead.
Here is a thread on tripods from NPN, both the tripod Igor recommended, and the one David Wallace bought look like good options that wont break the bank as much as a Gitzo would. In terms of Ballheads, I use the Kirk BH3.
If you are serious about getting better in landscape photography, tripods can make a big difference in taking yourself up to the next level. You will hate it for a few weeks, and then wonder why you didn’t do it sooner.