First build considering what to get

I want to get in and I've been getting silly with what I have with old laptops and virtualization but now I kinda want to get into a real home lab. I'm probably going to slowly accumulate the parts looking for deals seeing what I like but I would like a home lab for server hosting(Minecraft console ed, stoat, meshtastic), jellyfin, and NAS. I'm debating what to get. I'm eventually going to get some ddr5 ecc memory down the line so I'm going to slowly build towards that. the big question is what platform

LGA 1700

AM5

LGA 1851

unfortunately I'm not going with any epyc, or Intel workstation just cause most are either too power hungry or way to expensive or old(why I'm building towards ddr5.

as of right now AM5 seems like the best option. the AM5 MOBO list put by the community shows documentation of mobos that have ECC support. Intel does not have that or I haven't found it. I know that Intel CPUs do support it but the documentation is sparse except prosumer boards that barely mention it.

the reason I may be leaning to LGA 1700 even tho it's a dead platform is 12100, 13100 are good starting and Bartlett lake is coming with only P cores which is better in these situations. I don't want to mess with any E cores.

just looking for tips.