You DON'T sound like the type of person who could live w/ abandoning real-mode DOS...especially w/ multiple OS's on same 'puter.
I also recommend against ME because of the bloat; and because it's been winstoned as the slowest Win9x ever released. Then there's the version X.0 syndrome of any new M$ OS release. ME's got it in spades.
Only thing I can see recommending ME is removal of the former TCP/IP limit of 6 at-hand connections.
Or maybe you're one of those folx that assumes that M$' latest is their greatest....and ya just GOTTA get it in/OUT of your system. But you sound like you're above that.
To be sure, ALL Win9x's get "tired" after so many months of installs/uninstalls. But notable diferences exist between other 9x's:
1. Win95B (OSR2, OSR2.1) is the fastest and most stable (IMHO) of all the W9x's. It included FAT32 and was the last 9x that DIDN'T force a franticly "integrated" IE onto your system. It will want some patching (no big deal) to bring it up to date. Only notable downsides to this older (and trustier) OS is somewhat more limited USB support that its 98 successors. Oh, you'll likely "want" to download the IE 5.1 to support certain swares.
2. Win98 (original) forces IE4 (YECH !!) onto your system. It's a notch behind 95B on stability and bloat but also introduced a
little more system control/cfging. You'll want to update the IE to 5.1 (avoid 5.5).
3. Win98 SE starts w/ IE5 and throws in Internet Connection Sharing. It's otherwise damn near the same as original 98.
Good Luck !!!