Hi Ruddy, 
The best form of bite detection for bream and carp is a bobbin.
I've used them for donkeys years, my favourite is a washing-up bottle top that my dad used to use, (you can't get 'em now, different design.)[V] i've got 'em out of cork and pegs, and don't forget the good old, time honoured, cheap but 100% accurate, dough bobbin!
works best with a running ledger, cast out, put rod in rests pointing directly at where your fishing, tighten up, clip the bobbin on after the first eye or more, and then pull it down to a foot-two foot by taking line off the reel or any remaining slack.
carp take it up in one quick movement and bream take it up in two or three.
It works for me.
Sometimes you don't need to spend loads of money to get the job done.
And personally I think alarms are for folk who can't be a**** fishing.[:0]
In Ireland i use the "Side Winder" its a type of quiver that acts as a but indicator, its absalutley Brilliant.!! especially when its windy you aim your rod at your bait so your fishing direct to it which aids in hitting a bite and indication. It comes in 3 different types (just like normal quivers do) small for delicate bites and 2 mediums for the windy days.. Its not soo good if your fishing for carp, because you will end up picking up the rod at every line bite when you have a lot of active carp in your swim.Mal
if its sensitivity you want when they are finicy bitesdont dismiss the swingtip ive used them on carp water with baitrunners set so that there is just enough drag on freespool to give dtection on tip but this also allows for runaway bites.
Without a doubt, swingtip coupled with a fixed paternoster is the MOST sensitive. Use with a straight lead rather than a feeder because of the risk of wrap-ups on the cast. Use a heavy feeder rod with a large open end feeder to introduce your feed, and then cast your swingtip tackle over the feed area. A swingtip of 12" is far more sensitive than the finest of quivertips (the Sigma Wand tips included). Experiment at home if you are not convinced by my claim. Swingtipping was good enough for the likes of Freddie Foster and Ivan Marks. Bream have not evolved, but anglers have forgotten what a successful tactic this is for the shyest of biters - roach and small skimmers included.