OP here: after further thought, I couldn't make up my mind between a .308 or .30-06. But I knew what I wanted: a Browning X-Bolt (alongside the Miroku MK10 and the Browning T-bolt).
So I popped into my LGS yesterday and found out they had a composite stainless steel X-Bolt in stock, but only in 30-06. That was enough for me to make a decision! Also bought a Bushnell Elite 3500 4-12x40 with Leupold rings and bases.
I was actually after an X-Bolt that had a complete black composite stock, but the faux-maple upper half of the stock is actually starting to grow on me. At least it's something different to look at!
Thanks again for all the advice fellas, and here are some photos for your enjoyment!