Please suggest one.
You've got four basic options here:
There are advantages and disadvantages to all of these - some options need more effort and skill, some cost money, some you'll find won't be flexible enough, some are harder to upgrade (some themes simply don't get upgraded). I'd take a good look at the three "theme engines" I've mentioned above to be honest.
Note that I work for Adaptavist, albeit not in the Themebuilder team. I hope you can see that I'd have written the same answer even if I hadn't. Although TB really is great for heavy customisation
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