Like was asked and never mentioned what's the OP's budget? Casual means different things to different people, and a bargain stock may not be a bargain. I find with stocks you usually get what you pay for.
I have four rifles stocked in McMillan stocks, and like jmr40 I purchased all four secondhand. The most expensive being around $450 and the cheapest being $175 for a McMillan Winlite stock. I also have B&C and High Tech Specialties (now Legendary Arms Works) stocks on my rifles. While the latter two were cheaper to purchase they really weren't that much cheaper both costing nearly what a McMillian would.
The B&C is 2950 Mountain TI model installed on a M700 ADL .223 that cost me around $270 to buy. I knew it wasn't a drop in fit but I figured that I could handle the fitting. Well it had some issues that I couldn't correct with the tools I had so it went to a gunsmith to get fitted and $200 later I had the rifle back. So as you can see I was nearly $500 into a stock pretty easily.
The High Tech Specialties is the stock Mark Bansner designed, and is now sold under the Legendary Arms Works name. I bought this stock for $300, but it was unfinished and needed final fitting, bedding, glazing, and paint which cost me an additional $400. However, there wasn't really a better option for my rifle as it being a Mini Mauser my options were severely limited.
If you want a McMillan stock for a Remington M700 with out the McMillan price you might try
Grayboe Stocks. Ryan McMillan and partner started Grayboe, they haven't expanded the line much and they only inlet for M700 rifles and all the stocks offered are less than $400.
They are much heavier than a lot of the McMillan line but they are about 2/3 the cost.
If you don't spend the money upfront, you usually pay for it on the back end correcting issues. But it isn't my money spend it how you like.