I've asked similar questions here on Audiogon about Linn preamps and amps to drive Ninka's aktively, so you may want to search the posts for some of the responses.
Through those posts and some discussions with dealers, I think the LK85s are the best budget choice. They are low on power but in an aktive setup they only have to drive one speaker driver. The LK140s are very similar to LK85s but with more power. LK100s are older and probably not as good.
You can mix and match as all Linn amps have the same gain. Also, people recommend the best amps drive the high frequency drivers as that is more important to the overall sound.
One suggestion on preamps...there are several new Majik Kontrol preamps on audiogon right now for around 2000 USD.
Through those posts and some discussions with dealers, I think the LK85s are the best budget choice. They are low on power but in an aktive setup they only have to drive one speaker driver. The LK140s are very similar to LK85s but with more power. LK100s are older and probably not as good.
You can mix and match as all Linn amps have the same gain. Also, people recommend the best amps drive the high frequency drivers as that is more important to the overall sound.
One suggestion on preamps...there are several new Majik Kontrol preamps on audiogon right now for around 2000 USD.