My family has acquired a wide swathe of the Zakarisz sim (named after an obscure Star Wars character.) Outstanding mature green mainland sim. Some rolling terrain (some of which took some effort to unflatten) mostly naturally flat hilltop terrain. Well cared for (aside from one small ad farm), relatively lag free, great for home and/or business use. One of our lots is home to the "Brucehenge" shrine.
We bought most of this land from the Lindens at auction so the terraforming is mostly the original rolling grassland. The abutting landowners have mostly been respectful of the land although there are two places where the abutters flattened and lowered it. There are no huge problems with adjacent land being flattened and raised, although we did have to build a retaining wall on one lot. (Even in that case, the adjoining lot was not flattened excessively.)
For sale at reasonable market-rate prices (let's just say significantly less than 10L$/m.) Sizes from 1024 m^2 to 2036 m^2, plus a 96 m^2 and a couple of ad farm plots. Over 10k m^2 in all... start your own empire!
http://slurl.com/secondlife/Zakarisz/240/144
more locations:
http://slurl.com/secondlife/Zakarisz/85/77/57
http://slurl.com/secondlife/Zakarisz/107/86/61
http://slurl.com/secondlife/Zakarisz/182/77/78
http://slurl.com/secondlife/Zakarisz/202/14/77
http://slurl.com/secondlife/Zakarisz/233/86/85