Is there an English version Bible that has the best and oldest translations of the Septuagint and the Masoretic and the Aramaic texts all combined into one translation?
The very short answer is: "no".
- For the Greek Septuagint see NETS;
- for the Aramaic Targumim see the Aramaic Bible series;
- for the Hebrew Masoretic Text, any reliable public translation will do.
These textual traditions are sufficiently distinct that it would not make sense to have an amalgamated edition (which is what I take it is meant by "all combined into one translation"). One might have a "polyglot" edition setting out each tradition in running parallel, but I'm not aware of one that combines these traditions in English translation.
Best Aramaic (Syriac, Targums etc..) here. There's definitely a learning curve to the site.
Click on the left side of the screen "Search the CAL lexical and textual databases" & then click "Text Browse" or "Targum Studies Module"
Also Sefaria has amazing Hebrew (at top) & Targum (at bottom) translations. https://www.sefaria.org/texts/Tanakh
Targum translations https://www.sefaria.org/texts/Tanakh/Targum/Targum%20Jonathan