Joolz, it's great playing backup to Lugnut. He's right, you know. Look at what I said up above: one nice thing about Linn active systems is you don't have to use Linn amps. That goes for preamps too. You can have a wonderful Aktiv system eventually, and with careful shopping it will sound better than anything Linn can sell for the same money... or maybe even for a bit more.
Your Linn dealer will not agree.
Upgrades are expensive. Don't fool around; get the very best preamp you can afford. Do you absolutely, positively feel you must go Linn? Then in Linn-relative terms, the Majik is a lot better than the Classik, the Wakonda is a nice step up from the Majik, and the Kairn is a real upgrade from the Wakonda. In high-end relative terms, though, the Kairn is good; the Wakonda is OK; the Classik will do nicely in a bedroom. If you want REALLY musical, oh-darn-I-hate-to-turn-my-system-off sound for similar money, look elsewhere is good advice.