For P-TTL you'll need the Pentax specific model, sigma make this flash for each of the main camera manufacturers, keep a look out for a Pentax specific model.

My suggestion would be 2nd hand sigma ef-500 DG super, for this money. It has P-TTL, for correct amount of flash automatically controlled by camera, also works wirelessly off camera for when you progress, will work well with this lens and has enough power for casual use and a longer lens than you have currently.

Interesting hearing from one or two users of the new K-3 that focusing speed is increased for screw drive lenses, these guys don't sit still for very long,I'm wondering how much quicker? I guess I'm still in the 'shall I' stage, my K5ii isn't really ran in yet.
These taken with FA*200mm and 2x tele

I've not used the new 50mm lens but have had both the 35mm f2.4 and 40mm ltd, best for me in this focal length that is affordable is the DA 35mm f/2.8 ltd macro, so yes another option but I would not be without mine and these are available in excellent used condition around £250. Sharp, 1:1 macro, great build and focal length, small on the camera. It really should be a consideration IMHO.

Filters are sold, lens still available, if someone wants to take it at £75 inc RMSD?

Camera now sold. Thanks.

I use a manfrotto 393 on a 190xprob for k-5ii fitted with Sigma 150-500. Might be worth a look.

Gentle bump.

To more accurately describe the filters on offer, please see below

Jessops Effects Filter System

Starter Pack contains
Filter Holder, 58mm ring
GB1 – Light blue graduated filter
SKY – Skylight Filter
CU4 – Close Up +4 Filter
CS6 – 6 Point Star Filter

Portrait Kit contains
DF1 - Diffuser 1 Filter
DF2 – Diffuser 2 filter
81C – conversion Warm up Filter
SP1 – clear centre clear filter
SP2 – white centre clear filter
SP3 – grey centre clear filter

Black and WhiteSet contains
NT2 – Honeycomb Filter
BW1 – Yellow Filter
BW2 – Orange Filter
BW3 – Green Filter
BW4 – Red Filter

Landscape Kit contains
F1 – Fog Filter
GT2 - Light Tobacco Grad Filter
GBC – Cool Blue Grad filter
SS1 – Light Sunset Grad filter
GG1 – Light Grey Grad Filter
GD1 – Diffuser Grad filter

All in excellent used condition, there is also an additional finter holder, no ring.

I have a chance to get a couple of used lenses at the weekend, but I'll need to pay for them, so thought I'd offer my MZ-S up and see if there is anyone out there looking for one. Comes with Operating manual, body cap, pouched strap containing viewfinder cover, batteries are fitted, so it'll come ready to go. Rubber protection is all present and in very good condition. It's a stonking camera, £200 inc RMSD, payment by Bank transfer or Paypal, buyer pays fees.