Aha, cross rail.
I was going to suggest villages on the Oxford side of Marlow, but you'd be better on the Slough side for Taplow, probably. Pinkneys Green, perhaps? Bisham. Or how about Taplow Common, Eton Wick, Bray etc? And Wargrave, I think, has a rail connection to Bracknell iirc.
If you don't mind the other side, though, Frieth, North End, Ibstone, Fingest. Hambleden has issues with broadband, and there and Turville are over-priced, imo. Or Pheasants Hill, Fawley, parts of Lane End are OK, as are parts of Cadmore End (the A40 is really fast through there, so not great if you want to walk to the primary school), Stonor, Maidensgrove. It really depends what facilities you want - an awful lot of South Oxfordshire/Buckinghamshire villages are much smaller than the villages people talk about on MN: you won't find coffee shops etc here! Best case scenario would be a small shop, church and school - worst case, none of the above.
People are quite mixed. Not massively ethnically diverse, though there are more and more London emigres so that is changing - but on the level of one or two families in a village of 200 people. There are second and trophy wives too - Marlow itself is primarily visible as very middle class, in a sort of Boden/Joules/MN way, but there is a real mix of people, incomes and professions, once you scratch the surface. The villages are more divided in terms of income - a few very impoverished people, who are barely visible (as is common with rural poverty) and some who are ludicrously wealthy: Getty, Schwarzenbach, Branson, a fair few Iranian families, some Russians... Also quite stratified, in that there will be a handful of people whose families go back generations (usually at the lower end of the socio-economic scale), another handful who have been there 35-50 years ish, some who are round the 25 year mark and lots of turnover otherwise: especially Londoners, to be honest - although it's hardly serious rural living, it's still often too quiet and significantly less like the Archers than people often imagine. I personally find people in the villages are more down to earth than people in Marlow, but that is almost certainly as I'm born and bred in the area, and so know far more local farmers than I do people from Marlow!
I usually go in every week or so myself, for the bookshop and coffee. It's a shadow of its former self - when I was a child, there were mainly antique shops, bakeries, ironmongers, independent chemists, a good butcher, the lovely Maya of Marlow, Penningtons and Waitrose. Now it's eateries and chains - tempus mutantur and all that.
Feel free to pm me if you want any advice on villages, though - and for all my eye-rolling at Marlow, I am trying to convince my parents to retire to somewhere in the town centre!