Mature Mainland Class 5 sim for rent, can be residential or commercial
http://slurl.com/secondlife/Fermat/126/118/48
A Full Mainland sim (15,000 prims) - no covenant, so you can do what you want.
If you rent then there is NO up front money - after all you are renting so why pay anything other than the weekly rent of 19500L.
It is also for sale, however if you rent I will cancel the sale and not sell it as long as you are renting.