If and when you get the bug to install pillars (very much recommended), look at the Richard's Micro-Fit line of stocks. Not drop in by any means but with the price and selection, one of the better deals out there. They come pretty rough at times and sometimes pretty nice so be prepared to do some work on the outside for fit and finish. Know ahead of time that there will be work needed but everything you do to it makes it "yours".
I have or have had maybe 10 or 12 but I'am no expert, just appreciate the selection and cost of a nice stock for the $$.