If you intend to get into serious weak signal work on SSB and EME at 6m and above, get the best you can afford for loss per 100 feet....and...... the connectors can be an issue depending on how serious you become. My experience is that PL259 UHF hardware is not the best to use above 6m. The next level is type N connectors for any coax, semi hard and hard line. This hardware is much more expensive than the UHF types, so do yourself a favor and get the best installation the first time so you don't have to redue it it later. UHF hardware does not keep the impedence match at each connection point such that when you look as VSWR you are looking at a large sum of all the disruptions in the transmission line besides the line loss. Switching antennas at the far end of a single transmission line also demands the best antenna relays you can get hold of. I have been experimenting with all this on temp antenna installations and see all the issues that contribute to a good system and what it cost to install tbe best system to meet my needs. I have been advised by many people that LMR 400 would be good enough but that is their position not mine. I will be going with LMR 600 or more likely larger Heliax line very shortly for up to 70 cm permant installation. Remember that 3db loss per 100' at 400 mhz is half your transmit power waisted as well as recieve sensitivity.