Right StuntNun and Elspeth, I managed to trawl back and find something that I put earlier about following on from shred- just c&p so not all of it will be relevant.
It depends if you want more of the same or something a bit different really. I went from shred to 6w6p, it was nice to have the change from the 3-2-1 system for a bit. Instead you do a longer circuit, then do it again speeded up a bit. It has plenty of cardio intervals in it and will certainly get you panting and sweating. L1 the beginner modification is no weights, so you should be ok with 1kg weights if you want to use them. I didn't find the weights in it too hard though and was fine with 3kg (I couldn't do all exercises in shred with 3kg). There is a lot of plank work, and I can really feel that my core is stronger as a result. I even have a little definition in my abs now. It is a little bit longer though- about 35 minutes all in I think, but worth it.
I'm doing Ripped now and I like going back to the 3-2-1 system as it's another change. It's pretty similar to shred but seems a bit harder. I would recommend getting some heavier weights too- heavier weights will help burn the fat off a bit more so you'll see those emerging abs .
Another one about the same length is Killler Buns & Thighs, very popular on this thread. Another mix of cardio and strength, and working such large muscles really helps burn those calories too. that is circuit style too, so you do a few moves strength and cardio mixed up, repeat, then another circuit.
No reason you can't mix them all up a bit too. I have stuck to working through them but I have fitted other work outs around the one I'm doing at the time. When I was doing 6w6p I occasionally added in a Banish Fat Boost Metabolism or No More Trouble Zones (with either of those you could pick out some of the circuits to make it shorter as they're both quite long). Now I'm mixing Ripped and Killer. L1 shred with weights for the cardio and heavier weights is a fab workout too. Mixing it up stops you getting bored and makes sure you work plenty of different muscles.
HTH .
I've bought all the DVDs I use- I don't go to a Gym so less than £40 for seven DVDs seems ok to me. It's much easier to stop and start with a DVD (if there are any domestic emergencies or I need to pop the chips on for dinner 
), plus with BFBM and NMTZ it means you can pick and choose your circuits. You can always give them a try on YouTube before you commit to buying them.