Thanks for your comments but im looking directly into subfolder option (since TLD not an option and sub-domain considered bad practice from what i can gather after many days research on Moz etc
As a result this is what ill issue to a clients development team in this circumstance is as follows for where sites preferred structure is sub-folders/directories:
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Implement IP sniffing on the home page ONLY
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Then have Sub-Folders named after the official country abbreviations which will create a better user experience than both country and language i.e. domain.com/us/ as opposed to domain.com/en-us/ or domain.com/en-gb/ etc etc. This way it will only manipulate the homepage crawling and not site-wide indexing issues.
3) Target these folders to the correct countries in Google’s and Bing’s Webmasters Tools. Use the official country and language codes in the Hreflang mark-up as per point 4.
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Set up site maps for each subfolder and rel="alternate" hreflang= according to Google guidelines. Here's a great tool to help with correct implementation: http://www.themediaflow.com/resources/tools/href-lang-tool/
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Specify the content language/country by adding the 'country-language' meta-tags in the html head
6) Link between each country/language version in a crawl-able and visible manner (for SE and Users)
7) Create individual profiles in GWT & Bing Webmaster Tools for each country/language sub-folder and geo-target accordingly
Create individual profiles within GAnalytics for each country/language version and configure to track internal activity between different versions
9) Localise content so has US currency, contact details, spelling etc
10) Other localisation techniques ( such as marking up contact details with schema places code)
Note RE: HrefLang & Canonicalisation:
An extra advantage of using hreflang is that it will provide a degree of canonicalisation. Should canonical tag be employed in the future never so across language versions if site expand into non English versions. More info here: http://www.youtube.com/watch?v=Igbrm1z_7Hk