Thanks for replying back on this thread and sharing your recommendation. Anyway, Can you explain, How to migrate from DigitalOcean to Linode? Sorry for asking you again :(
Did you try this article? It is a tutorial for moving a wordpress blog from a Linode VPS to a DO VPS (the opposite of what you're asking), but contains many steps and general tips that you will find useful. https://www.digitalocean.com/community/tutorials/migrate-you...
In general terms, you'll be looking at something like this: boot a fresh VM at Linode, apply updates, and install all your needed packages. Stop services on both hosts. Copy the necessary data/config files to the destination host, using a tool such as scp or rsync. Set permissions/ownership on destination files if needed. Start services on the destination host, test everything, reconfigure dns, and you're all set.
FWIW, I've been a happy linode user for 5+ years. I have nothing against DO, I've just never had cause to use them yet.
Incidentally, you mentioned in your blog that you tried a range of shared-hosting providers (HostGator, Bluehost, iPage...) finding them all unsatisfactory, before deciding to move to a dedicated VPS. You may or may not be aware that all three of those providers (and many more) are actually owned by one parent company, http://en.wikipedia.org/wiki/Endurance_International_Group (i.e.: by trying a set of commonly-owned companies you may not have ended up surveying a particularly diverse cross-section of the market).
And the article on digital ocean covering WordPress moving tutorials is great, hope this will work when finally come up with the situation to switch Linode.
Thanks again for valuable comment :)