ok to answer a few queries;
Soldering itself is a bit of a skill but like everything just a bit of practise. I bought a 
basic noise machine kit which is very noob friendly so i didnt break anything too important. You can even just buy a bag of resistors and some perfboard for a tenner and solder em all together.
Once youve done that, and got some soldering chops, the shruthi is pretty easy. The instructions are very clear and you just have to go relly slowly, double check everyhting, twice ! and it should just come together. 
The basic kit is about £130... you could get the bits cheaper but youd have to spend hours finding and ordering all the bits, making sure you get the right bits, and it does take hours... the shruthi, x0x and other kits are generally a lot better for noobs than just schematics or random pcbs. THeres also the nicer filter boards (Roland clone, CEM, SSM2044) etc which are a bit more advanced as you need to source and 'stuff' (solder in all the bits) without a step by step guide. Im going to get the Roland IR3109 board for the shruthi, theres a sick programmer on the way, which also allows you to add two filter boards to the shruthi, 3 analogue filters in parallel the sick.
But the IR3109 chip is around £30 itself, and obsolete, and theres fakes floating around... 
 
But you also need, as a bare minimum, a soldering iron (as much as you can afford, £20-50), some wire utters, a digital multimeter (£10+) some solder (DONT buy crappy maplins lead free, its a nightmare to work with (£10+) and a solder remover/sucker (£4ish). And more tools are obv very helpful.
So price depends on hat yovue already got, and your long term interest. Its prob cheaper to buy a mopho or whatever, and it wont 'waste' four days building it. But if youre interested in the general idea, make the investment and you can literally build or mod what ever you want. 
Ive got a bit involved with it all recently i must admit, after the x0x and a mixer PSU, ive got a 808 clone to build ... heh, that will be a real challenge. Also thinking of a midi controllable one playable in pitch. Its doable, but prob be a bit of a head scratcher. 
Tons on nice helpful folks around tho, see muffwigglers and electro-music DOY forums.
Hope this is helpful.
