So I am in need of a new amp as mine isn't loud enough, and I figured of all places, this would probably be somewhere to get some decent advice.

Right now I am playing a LTD B-55 through a Fender rumble 60 combo. The amp sounds alright, but I don't have nearly enough volume at shows and at practice (I am competing against a loud drummer and two 120watt solid-state combos)

Basically I am looking for something around 200-300 watts, and less than $750.

I have considered a GK 115 BLX-II with a 210 BLX-II and a Backline 600 head.

Does anybody have any experience with this kind of setup? Or have a better idea?
I am just trying to get some preliminary ideas for what I should get.

Well that doesn't sound surprising since you are currently playing thru a rig with half of the volume of your guitar players. Why not try the Acoustic set up? its 200 watts with head and cab for $549.98. Although I play with Ampeg, I would also play with the acoustic.

Tonight won't be your last

Fender Hot Rod Deville 212
Schecter C-1+
Ampeg B25B & SVT 15
I'm going to say... Get a nice combo, really, for 200 watts, hell even 300 it seems a waste to invest in a halfstack. Get a nice carvin, acoustic, peavey, etc amp or save some more to get a halfstack worth the price/
You probably get a SWR Black Beauty for around 600 used.
Jackson DXMG With SD Blackouts
Jackson DK2M
Ibanez GSR205EX
Acoustic B200H W/ Acoustic B410
Peavey Vypyr 30
thanks for the advice everyone
Ride For Wrath, Ride For Ruin, Ride For Death... Wrathrider!
Kustom makes some great stuff, cab wise and amp como wise so check it out
Schecter Scorpion 4 Neck Thru with EMG Hz's
Schecter Custom 4 with EMG Hz's
Tech 21 SansAmp Bass Driver D.I.
Kustom Groove 1200 HD Solid State Amp
Kustom Groove 8-10"s
BBE 482i Sonic Maximizer