I'm looking for a synthesizer that allows me to upload my field recordings on to it. And one that also has an interface. Say like ableton's sampler so i can put the marker on a certain part of the audio of my field recordings.
If you have an iPad and/or iPhone there are a ton of options from NanoStudio which supports user wave upload and record, through to granular synthesisers like Grain Science that will let you sample direct, upload and then manipulate the waveforms.
Dedicated hardware samplers like the Korg MicroSampler are good value these days (you can get one for 245 quid on Amazon) - a few years old now but packed with features, a keyboard, gooseneck mic, pattern sequencer, etc etc - it's probably closest to a traditional synthesiser instrument that you may be thinking of. Hope this helps.
Image-line Harmor and Camelaudio Alchemy have useful resampling functions. Izotope's Iris is basically an advanced resampling unit with with Photoshop-styled audio editing functions, its quite well suited to anything on the ambient tip.