In reply to Rick Asher:
The Finnmap series (for all Nepal) is topographically the 'best' and most accurate map but as Tom mentioned above, some of the actual trekking maps you buy in KTM are more useful. They have more villages and structures marked, often with little notes etc.
Also different trekking maps have slightly different coverages, ie. some may include the upper Hongu area to the east (for the Amphu Lapcha approach etc) and not the Thame valley to the west, or vice versa. Whereas the coverage and boundaries of the Finnmaps is based on other factors. So it depends exactly where you're going and what you're doing in the area.
Before the Finnmap series, the best topo was the 1:50,000 'Schneider' map 'Khumbu Himal' - they also did Annapurna, Langtang etc - distinguishable by their colours (Khumbu light green, Annapurna pink etc) and they are still in shops in many places but I wouldn't bother. They were a collab between the German and Austrian alpine clubs. But while topographically excellent, that series is well out of date in terms of human developments - villages, bridges etc - and also expanding glacial lakes. There is an updated version though, which looks good, though I don't personally have:
https://www.themapcentre.com/2-khumbu-himal-nepal---schneider-nep-20-15250-...
Post edited at 22:53