I have an 06 HSE with NAV and a rear locking Diff. The bluetooth works great with my iPhone or Android (however it doesn't seem to automatically connect) which is no big deal as I can quickly do that. The stock Hitachi EAS pump actually isn't a bad unit if you keep the silica beads in the dryer in good condition. I'd certainly not recommend the V6. The 4.4L Jag engine is very reliable and coming from RRC/D1/D2/P38's I think 300HP is plenty.
My 06 has every option except the little center console cooler. The heated windscreen is nice, the HID headlights are superb, the auto sensing wipers work great, and the F/R park distance control is also handy when parking in tight spaces. The one thing I love about having an early 06 vs later 07-09 models = no stupid TPMS crap to worry about! I also was able to update my NAV system to the latest software and 2015-2016 Maps which helped it's functionality greatly
I got my 06 HSE with 94K on it for 10.9K. I had to replace the brakes, brake switch (which caused some serious glitches), and I also had to remove the front valve block and clean the center valve as it was sticking causing only the nose to drop over night.
If it was me personally I'd hold out for a clean HSE with all the options or a fully loaded SE with pretty much everything with the exception of the HSE's better stereo. You can find fully loaded SE's with the rear locking diff, but they're harder to find.
If you aren't familiar with LR's or the LR3 I'd certainly have it inspected before buying it. If the TCM has corrosion it can cause all sorts of issues and it's about 1K to have replaced/reprogrammed. The EAS is a pretty reliable system, but like all things it will eventually need routine maintenance to stay in tip top shape. The lower control arms normally go about 50-75K before they need replacing and you can tell if they're worn out by listening for a dull clunking noise under braking or on a bumpy street.