Ok, I will be brave enough to compile a map cycle. Other people can either criticise, and we will go from there or recommend their alternatives.

On vote maps:
de_prodigy
de_nuke
de_aztec
de_piranesi
de_train
de_inferno

cs_italy
cs_compound
cs_office

de_inferno_pro * replaces de_inferno_old
de_losttemple_pro * stays
de_cpl_mill * fixed
de_cpl_fire * stays
de_contra * fixed
de_strike_rc4 * stays
de_rush * new
de_crane * new
de_crossfire_final * stays

Off vote maps:
de_dust2
de_cbble

When vote fails map cycle:
de_aztec
de_dust2
de_cbble

cs_office
cs_italy


So the half of our vote map cycle are custom maps, IMO good ratio. In addition to that, most of these are well known and are chosen for matches.
de_dust2 + de_cbble - good maps but I think should be left for when vote fails, there are plenty of 24/7 servers.
de_dust should be left out, I think, biased map and people hardly ever work together on it, so when you have more than 7 people on each side Terrorists end up camping spawn and snatching a few rounds when some good player actually persuades everyone else to rush out.
3 most popular cs maps, 2 of them are on vote-fails list just to spice it up a little bit. There is cs_office_unlimited, which works very well with servers with 20+ on each side, but unfortunately we don't get that many players on KM nowadays, so putting such a big map on the server is useless.

Please note that contra and mill are fixed versions, contra is called pure (had problems with loading some textures) and cpl_mill is called noexploit (low gravity exploit fixed).

One change I am unsure about is removal de_inferno_old. I LOVE OLD INFERNO! But unfortunately de_inferno_old is a very old map, with several known exploits, several missing textures, no support from original author and, lets face it, is hardly ever played anywhere. Basically, its a thing of the past. A replacement is another CEVO map called de_inferno_pro. It's basically inferno but it doesn't look that fancy, so your PC doesn't turn into cheese when you play it and its got some nice changes, which are influenced by old-school inferno. And its got support So might aswell try putting that on the map cycle.

All feedback is welcome. Lets build the best mapcycle ever.