What is your concern with Standard Edition memory - I would have thought that 64GB isn't ridiculously low
The issue for me is that it hasn't moved with the times, so the limitation is getting increasingly out of date. To be honest, I think SQL Server (and Oracle) licensing in general is getting out of date.
Speccing up to 512GB of RAM in a modern server is under £5000. That's small business territory, but you'd have to plump for Enterprise Edition to use it.
Say you wanted to spec out a reasonable 4U server (40 cores, 512GB RAM etc.) it might come to around £25,000. To fully license it for any edition of SQL Server you'd need to spend £180k+ on EE licenses. That's a much higher ratio of hardware->software spend than it was 5-10 years ago.