Alright with the release of the new Skaven army I'm going to start a new Skaven army themed around the Plague Monks of Lustria,after checking out some rumors about the probable course for the Skaven army book.
I'm going for a lowish model count (For Skaven)army
This is what I'm thinking for army composition.
Lord Skroll Allows Plague Monks to be taken as core,rumored to be extremely expensive (good for me) Like the model to.
Hangs in one Plague Monk unit.

Plague Priest on Plague Furnace,Goes in the other Plague Monk unit,this is the main combat unit.

Warlord (or whatever the vanilla hero choice is) BSB,joins either Clan Rats or Stormvermin.
I'll use this model and chop off one of his hands and slap a suitable banner to it.

Core
2-25 man Plague Monk units,one with the Plague Furnace the other with Lord Skroll,these will act as my main assault units in an army of assault units.

20 man Clanrat unit Spears and shields,nice and cheap might be joined by the BSB.

20 man Stormvermin unit,Halberds and all the fixins,these unit is to act as another assault unit.

A couple Rat Swarms I should be able to make severl and buy a couple.

Maybe some giant rats.
Special
One or two units of Plague Censor Bearers,just for that extra killiness.

2-4 Rat Ogres,I know they don't fit the theme but they would work very well with the rest of the army.

At least one unit of Globadiers

Rare nothing really interests me here so let's skip to the next part,unless the Plagueclaw Catapult is down there and then I'll wait for a model for it.
Total money cost for this army,let's break it down.
Lord Skroll $15
Plague Furnace $57.50 (abit expensive but well worth it and there would be all the extra bits from not building Screaming Bell

)
Warlord BSB $15 (with abit of converting)
Stormvermin $49.50 (abit surprised by there cost,hopefully the models will help me with my sticker shock)
Clanrats $33
Plague Monks $35 each I'm going to need at least 2 so $70
Rat Ogres $40 (but I get the stuff to make some giant rats so not all bad)
Plague Censor Bearers 4 for $13.25 (not bad I can do that once or twice without breaking the bank)
Poisin Wind Globadiers 3 for $9 (I'm most likely only going to need about ten)
Rat Swarms 2 for $17 (I'll buy one set and build a few of my own.)
So a total of $393 give or take abit and figuring that they'll release a Battalion with at least some of the stuff on my list will lower the cost significantly,what I'll most likely do is buy them in $100 batches so that I don't blow everything all at once.