Pdw is 80k and is worth it now since the gun nerfs, thompson also is 75k. Those are probably the best choices for basing also thompson is good for spar so a good starter all round gun until you can afford something else, however if it is spar you wanted to focus on then get m4, sten or GT SIG 15. The GT SIG 15 is only 60k and is really underrated in my opinion one of my friends used it to get 100k pks.
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They added new and better guns.
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Problem with doing auctions with only 100k gralats is that most likely you will get a meele as guns go for a lot more since everyone seems to want them, in my opinion meeles aren't worth it when you can just get a cheap meele from trade that can take a base flag easily not sure why else you would want a expensive meele apart from to show off.