I live in Pollokshields in Glasgow, which, although it is a very wealthy suburb has quite a high "middle class" Indian community and adjoins an area with a very large Indian community (more tenements than villas, but uupmarket ones). I've never encountered any racism - although there is some of the "unthinking" racism - for example, comments on how "Indian" Albert Drive is becoming - without recognising that it is the Indian community that is keeping the shopping area alive.
The Indian community is generally fairly well integrated in Glasgow - they will normally consider themsleves to be Scottish as well as Indian. (Having said that, I'm not denying what M2T has said - I come from a fairly sheltered background!).
Dh tells me that the Indian community is diferent to the one more generally found in England, ie they tend to come from a different bit of India - I always forget which bit. I thik it's that they're NOT (or they ARE?!) Bengali. It's evident in Indian food we get - pakora are the snacks, rather than bhajis/samosas.
Where are you looking at? Balfron, Killearn, Drymen, Strathblane are all good places (with good schooling) - although according to Billy Connolly (who used to live there), they can be a bit snooty in Drymen. I think it's like any village - if you get involved, you'll fit in. Most of these places are becoming commuter villages for Glasgow, so a lot of people are moving out there anyway.
The "racism" that is more prevalent in the West of Scoltand is the religious bigotry - catholic versus protestant. Again, given my relatively privileged background, I never really came across it, but it does exist.
I don't think you and dh being a mixed couple would be an issue. Being English may (but only may) be more of an issue - but again, it's a case of getting stuck in. The problems usually arise if there is a perceived arrogance. There are many English "adopted Scots". My own parents are South African adopted Scots.
For quality of life, you can't beat it. The area north of Glasgow is stunnigly beautiful (I drive out to Balfron every week for my Pilates class) and you have the facilities of Glasgow (good shops, nighlife, restaurants, culture) on your doorstep. (.... actaully, sore point there - I need to pay my council tax today, I help subsidise all those fantastic facilites for the commuters!)
If you've got any more questions, just ask - or ask Mumsnet to give me your e-mail details.