Took the liberty of pricing those with one of our site sponsors.
Film/Digital

14-24 f2.8 £1299
16-35 f4 VR £849
24 f1.4 AF-S £1549
24-70 f2.8 £1235

24-120 f4VR £819-SALE

28-300 f3.5-5.6 VR £669
35 f1.4 AF-S £1399

50 f1.4 AF-S £279
50 f1.8 AF-S £159-SALE
55-300 f4-5.6 VR £239 (DX Only?)

70-200 f2.8(I and II) £1029
85 f1.4 AF-S £1199
200 f2 VR £4349
200-400 f4 VR (I and II) £5099
300 f4VR £999
400 f2.8 VR £6999
500f4 VR £6199
600f4 VR £7299

DX (APS-C)
10-24 f3.5-4.5 £639
12-24 f4 £849
17-55 f2.8 £1099
18-200 VR (I and II) £589
18-70 f3.5-4.5 (Discontinued?)

35 f1.8 £159
60 f2.8 AF-S Micro £399

D7000 - £642
D7100 - £949
D600 - £1439
D800 - £1941
D4 - Sale! £4249

Lots of options there for sure. I have italicized the value offerings
Not so sure Pentax SMC lenses are so outrageously priced afterall now. And they are missing some focal lengths as well... 31, 43 and 77 for example.

Pentax are by far the easiest and cheapest route to get a Body / Lens combination with WR without breaking the bank. K-30 and 18-55 + 50-200 will be under £700 new. Nothing comes close. If you want to step up to something faster, then there is the DA* line, expensive yes, but they are comparably priced to the competition.

What Apertures do you shoot at? If all wider than say f/2.8?, jump ship, and get the set of Nikon f/1.8s (35, 50, 85). K-5 and your lenses would bring in around £700 minimum. But where do you go for WR? And what does £700 bring you in the other camps?

If not, sell the WR, DA and A (75, 125, 75) add £200 to the kitty and think about the DA*16-50 to cover that range and wider and then save for the Samyang or DA70 I suggested.

DA55-300 sell at around £190 mark here, Tamron will get you £75, is it £115 better? probably, but is it going to give you twice the value despite better contrast, colour rendition, quick shift and cheaper filters? only you can answer that.

To upgrade the DA35 to the FA35 will cost you £100 or so, worth it? Nah, I'd suggest the DA35 Limited (I picked one up here this week for well under £300), get up close and personal and find out what a Limited feels like, its a totally different tactile sense added to your photography.

A50 f/1.7 to a DA50 f/1.8? Another £100 or so, might as well go another £50 and get the FA50 f/1.4, if you don't like it sell it, any loss you make if any is lens rental , put it towards the DA*55 and you'll wonder why you were looking for a 85 and have WR

It's gonna cost whatever which way you look at it.

Is your lens list current? As in WR kit, DA35, A50 and Tamron?

Keep away from available red light with the K-7, iso3200 usable in Raw format. 43 and Samsung sensor sing sweetly together. Enjoy

2nd hand DA70 in place of 85, probably a bit over 300
There is a mint FA35 f/2 on offer in the classifieds, (PengBai) 230 I think
DA50s appear here every now and again for the 150 mark
28? You'll be looking looking at a Sigma I think or start saving for a 31 which actually would be near enough the same taking Canon v Pentax crop factors. Quite a different return image wise though

Took me over 4 years saving, trying, using, selling, buying, loving, hating, being wowed, beingddisappointed to get my little collection of optics. Patience sometimes is best, besides, it takes a few months usage to begin to understand each lens.

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All K-5 test shots have been uploaded here. I'm in the process of creating contact sheet type jpegs for each lens and each aperture. All original sizes can be seen in my gallery if selected.

, no problem at all David. Your shot is stunning. And yes it was your old lens.

@Deyrn, Yes I cropped the stem so that the blue head was in the crosshair of the lower right quarter of the shot. I'll redo with a tighter crop later on this evening. Appreciate you input.

MIV version though. MIJ specified

Wondering the same thing