Unless your L700 is really old I suggest you just arrange a new 
maintenance contract.    They are pretty solid.  You can have mixed LTO 
and DLT drives if you really need to.  Otherwise use LTO2, though you may 
find that the NDMP backups cannot drive them fast enough, though it may 
speed up if you use NBU 5.1.

I suggest you keep the 7 LTO1 drives, and fit LTO2 to replace the P3000 
capacity - you will not need many to replace the DLTIV capacity.  The L700 
takes up to 20 drives.   The LTO2 drive can read and write LTO1 media, 
*but* NBU does not understand this at all - it has no concept of backwards 
compatibility.  So you have LTO1 as HCART and LTO2 as HCART2, and they are 
as separate to NBU as DLT and LTO.

StK are now selling the SN3400 router (a Crossroads box, similar to the HP 
M2402 router) if you are using SCSI drives and a SAN.  For a master server 
you might get away with a SunFire V440 - has an onboard GigE (but don't 
use the ce0 port).  You need one CPU per active GbE connection, and also 
one CPU per LTO2 drive...but in practice it will drive quite a bit. 
Depends if it just a master or master & media server.  Note that the 
Netbackup for NDMP server takes a hit over the network, as the catalog 
infromation comes in from the filer.  Could have V440 master and V240 
media servers....lots of options.  I don't think I recommend a Linux 
master, but others may differ.

William D L Brown