Well I have been told that v1.04 is stable however I won't be able to confirm it until my new 826L arrives from a tested engineer at D-Link. Thats a great price for this router. I have enjoyed mine even on v1.02 and for me, is the current verified most stable FW version. I'll post my results when I get mine and test it. It was mentioned that HW issues could have been seen and mine was part of that batch. If your in EU, I presume you may not see this issue and using v1.03 and v1.04 will be good.
Does NE have any specials running on the DIR-868L and a DWA-182? I thought someone said that NE was selling the 868L and either giving away the 182 or the cost was half for the adapter. I presume the 836L is a good model too, just faster WiFi connections however if your devices don't support the higher connections, might not need it. Could future proof though.