I was considering the 1MB SIMM update, and found out there are quite many possibilities, so I went the easy path and expanded the 130XE to 320XE, that's an easy one. The 1MB SIMM update is still on my TODO list, but I don't have any spare 130XE right now. I've got two, one will remain pristine, the other one has that 320XE mod already.
I am expecting some 800XLs in a few months, and might go that path instead.
There's actually quite a number of 1MB SIMM updates - I need to review them and evaluate. As a beginner, I am not quite up to speed with all those RAMBO/COMPYSHOP etc. standards
Ctirad's module is impressive, and I've heard a lot of positive feedback - but I don't like such a big beast sticking out from my Atari. It always reminds me the legendary TI99/4A expansions