I just purchased a 2003 discovery SE7

honestly Land Rovers are junk. I would have advised against buying one with that many miles, or one at all for that matter. Cut your losses and buy something reliable like a Honda or Toyota. Don't get it fixed it will give you nothing but problems.

This is a super old question, but after reading the previous answer i thought I'd try and put a different spin on this. I had a 2003 "disco" 2 years ago, and although i never had a head gasket fail i had just about everything else they are known for. Fixed the sagging headliner, leaking sunroof, three amigos light, replaced cracked front bumper which they all seem to have, rear door latch, hi/low 4wd solenoid, and I'm sure a couple of other things. It's British, it's... problematic. I feel they are still trying to get back at us from the whole 4th of July thing. You have to "want" to own one, it will ask a lot of you to make sure you truly want it. As the previous responder pionted out its not a Honda, which is a strength not a weakness. Who wants to drive a Honda, you drive one of those because you need to, not want too. No passion. If you own one, for whoever might read this in the future, first step is to understand the relationship your in. Then if you're good with that, start tackling one issue at a time. Every problem regardless of how big is only a series of nuts and bolts, take one at a time. Oh and don't try and make them perfect. Do just enough. It's like whack-a-mole, you'll never reach the end if you keep going.