That a look at this thread - lots of good info if you can get through all of it
http://www.bbcboards.net/showthread.php?t=982657
I have 4 Prismatic 200amp bare cells in our RV - Built my own BMS - it's been wonderful for the past 4 years
It's not at all difficult to get all the charging systems Li compatible
Inverter use with Li as compared the LA is night and day better
Picked up two of the 100amp G31 "drop-ins" from Lithium hub for the boat - Used them for about 6 months now and LOVE them - The Bluetooth interface is a wonderful added functionality
To each their own
For us Li batteries are the only way to go