Personally...I'd move the GR1225 to GMRS (since the repeater can actually disable PL on ID) and switch the Kenwood's in place of the amateur repeater (assuming they are all UHF). The GR300s are okay, just a pain to deal with versus the Windows programmable R1225 module and the Kenwoods.
Well currently they both work well. Last year the GR300 got the idomatic 4 with voice since it just had the basic cable. The GR 1225 I used to have the PL stripped for the id but I now allow it to come through to so it can id the 6 meter FM simplex link that sits next to it. Then I have the UHF and VHF repeater linked via UHF radio from separate sites (in and out of all 3 frequencies work). Echolink is also in the mix as well as Echoproducer so thats where most of the bells and whistles come from on the ham side of things.
I got a great deal on 4 8180's so I figured I would use them as replacements or backups and dont need an old computer to program them. I have a 7180 and 8180 in the mobile and as a base and I have the 2180 and 3180 also for ht's that I have acquired in recent years so when I came across these I figured they would be good for repeaters.
Planning to get another idomatic for one pair of them and will just use the other idomatic I have for the other pair. I just need to find out more info on the hook up and the programming of the pins.